We look at the division of 91864819 by 578 
The aim is to understand the frequency of 578 in 91864819.

Going ahead to step 1:
When dividing 9 by 578, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 578

Moving on to step 2:
The number 578 fits into 91 0 times, leaving a remainder of 91.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 91, we get 91.
Take the next digit (8) from the dividend and append it to 91, then repeat: 918 / 578

Advancing to step 3:
918 divided by 578 is 1 with a remainder of 340.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 578 from 918 leaves us with 340.
Bring next digit (6) of the dividend behind the 340 and repeat the process: 3406 / 578

Moving on to step 4:
When dividing 3406 by 578, we get 5 with a remainder of 516.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we subtract 2890 from 3406, we get 516.
Include the next digit (4) from the dividend after 516, then repeat: 5164 / 578

Step 5:
5164 divided by 578 is 8 with a remainder of 540.
The next digit of our result is 8. 
Result so far: 158.0
The remainder is 540 after subtracting 4624 from 5164.
Include the next digit (8) from the dividend after 540, then repeat: 5408 / 578

On to step 6:
The number 578 fits into 5408 9 times, leaving a remainder of 206.
Write down 9 as next digit of the result. 
Result so far: 1589.0
If we take 5202 away from 5408, we end up with 206.
Grab the next digit (1) from the dividend, add it to 206, then carry on: 2061 / 578

Step 7:
If we divide 2061 by 578, we get 3 and a remainder of 327.
Record the quotient 3 as the next digit in the result. 
Result so far: 15893.0
Subtract 1734 from 2061 to get 327.
Fetch the next digit (9) from the dividend, attach it to 327 and continue: 3279 / 578

On to step 8:
578 goes into 3279 5 times with a remainder of 389.
Write down 5 as next digit of the result. 
Result so far: 158935.0
Subtracting 2890 from 3279 leaves us with 389.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3890, and continue the process.

Let's proceed to step 9:
The number 578 fits into 3890 6 times, leaving a remainder of 422.
Use 6 as the next digit of our solution. 
Result so far: 158935.6
The remainder is 422 after subtracting 3468 from 3890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

On to step 10:
578 goes into 4220 7 times with a remainder of 174.
Use 7 as the next digit of our solution. 
Result so far: 158935.67
Subtract 4046 from 4220 to get 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

Advancing to step 11:
1740 divided by 578 is 3 with a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 158935.673
Subtract 1734 from 1740 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 12:
The number 578 fits into 60 0 times, leaving a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 158935.673
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 13:
The number 578 fits into 600 1 times, leaving a remainder of 22.
Put 1 as the next digit of the answer. 
Result so far: 158935.67301
If we subtract 578 from 600, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 14:
578 can be fit into 220 0 times, resulting in a remainder of 220.
Write down 0 as next digit of the result. 
Result so far: 158935.67301
If we subtract 0 from 220, we get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 15:
The number 578 fits into 2200 3 times, leaving a remainder of 466.
Put 3 as the next digit of the answer. 
Result so far: 158935.6730103
Deduct 1734 from 2200 and we're left with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

Going ahead to step 16:
If we divide 4660 by 578, we get 8 and a remainder of 36.
The next digit of our result is 8. 
Result so far: 158935.67301038
Subtract 4624 from 4660 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The quotient of the division is 158935.67301038, and the remainder is 3.6e-08.