66146578 ÷ 828 
The aim is to understand the frequency of 828 in 66146578.

Advancing to step 1:
The number 828 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 828

Advancing to step 2:
828 can be fit into 66 0 times, resulting in a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Include the next digit (1) from the dividend after 66, then repeat: 661 / 828

Advancing to step 3:
661 divided by 828 is 0 with a remainder of 661.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 661 to get 661.
Take the next digit (4) from the dividend and append it to 661, then repeat: 6614 / 828

Let's proceed to step 4:
6614 divided by 828 is 7 with a remainder of 818.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 5796 away from 6614, we end up with 818.
Append the next digit (6) from the dividend to 818 and continue with: 8186 / 828

Moving on to step 5:
828 can be fit into 8186 9 times, resulting in a remainder of 734.
Write down 9 as next digit of the result. 
Result so far: 79.0
The remainder is 734 after subtracting 7452 from 8186.
Bring next digit (5) of the dividend behind the 734 and repeat the process: 7345 / 828

Step 6:
When dividing 7345 by 828, we get 8 with a remainder of 721.
Put 8 as the next digit of the answer. 
Result so far: 798.0
Deduct 6624 from 7345 and we're left with 721.
Bring next digit (7) of the dividend behind the 721 and repeat the process: 7217 / 828

On to step 7:
The number 828 fits into 7217 8 times, leaving a remainder of 593.
Put 8 as the next digit of the answer. 
Result so far: 7988.0
Subtract 6624 from 7217 to get 593.
Append the next digit (8) from the dividend to 593 and continue with: 5938 / 828

Moving on to step 8:
5938 divided by 828 is 7 with a remainder of 142.
The next digit of our result is 7. 
Result so far: 79887.0
If we subtract 5796 from 5938, we get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Advancing to step 9:
The number 828 fits into 1420 1 times, leaving a remainder of 592.
The next digit of our result is 1. 
Result so far: 79887.1
Subtracting 828 from 1420 leaves us with 592.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Step 10:
If we divide 5920 by 828, we get 7 and a remainder of 124.
Use 7 as the next digit of our solution. 
Result so far: 79887.17
If we take 5796 away from 5920, we end up with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

On to step 11:
828 can be fit into 1240 1 times, resulting in a remainder of 412.
The next digit of our result is 1. 
Result so far: 79887.171
Subtract 828 from 1240 to get 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

Advancing to step 12:
828 can be fit into 4120 4 times, resulting in a remainder of 808.
Use 4 as the next digit of our solution. 
Result so far: 79887.1714
Subtracting 3312 from 4120 leaves us with 808.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8080, and continue the process.

Going ahead to step 13:
828 goes into 8080 9 times with a remainder of 628.
Put 9 as the next digit of the answer. 
Result so far: 79887.17149
Subtracting 7452 from 8080 leaves us with 628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

Advancing to step 14:
6280 divided by 828 is 7 with a remainder of 484.
The number 7 becomes the next digit in our result. 
Result so far: 79887.171497
Deduct 5796 from 6280 and we're left with 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Let's proceed to step 15:
4840 divided by 828 is 5 with a remainder of 700.
The number 5 becomes the next digit in our result. 
Result so far: 79887.1714975
If we subtract 4140 from 4840, we get 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Moving on to step 16:
If we divide 7000 by 828, we get 8 and a remainder of 376.
Record the quotient 8 as the next digit in the result. 
Result so far: 79887.17149758
Deduct 6624 from 7000 and we're left with 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

The final result is 79887.17149758 with a remainder of 3.76e-07.