We're dividing 90345773 by 64 
The aim is to understand the frequency of 64 in 90345773.

Going ahead to step 1:
If we divide 9 by 64, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 64

Let's proceed to step 2:
The number 64 fits into 90 1 times, leaving a remainder of 26.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 64 from 90 to get 26.
Take the next digit (3) from the dividend and append it to 26, then repeat: 263 / 64

Let's proceed to step 3:
64 can be fit into 263 4 times, resulting in a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 14.0
Subtract 256 from 263 to get 7.
Take the next digit (4) from the dividend and append it to 7, then repeat: 74 / 64

Going ahead to step 4:
If we divide 74 by 64, we get 1 and a remainder of 10.
The next digit of our result is 1. 
Result so far: 141.0
Deduct 64 from 74 and we're left with 10.
Grab the next digit (5) from the dividend, add it to 10, then carry on: 105 / 64

On to step 5:
64 goes into 105 1 times with a remainder of 41.
Write down 1 as next digit of the result. 
Result so far: 1411.0
Subtracting 64 from 105 leaves us with 41.
Take the next digit (7) from the dividend and append it to 41, then repeat: 417 / 64

Step 6:
When dividing 417 by 64, we get 6 with a remainder of 33.
Write down 6 as next digit of the result. 
Result so far: 14116.0
If we take 384 away from 417, we end up with 33.
Append the next digit (7) from the dividend to 33 and continue with: 337 / 64

Going ahead to step 7:
The number 64 fits into 337 5 times, leaving a remainder of 17.
Put 5 as the next digit of the answer. 
Result so far: 141165.0
The remainder is 17 after subtracting 320 from 337.
Grab the next digit (3) from the dividend, add it to 17, then carry on: 173 / 64

Advancing to step 8:
If we divide 173 by 64, we get 2 and a remainder of 45.
Use 2 as the next digit of our solution. 
Result so far: 1411652.0
Subtracting 128 from 173 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 9:
64 goes into 450 7 times with a remainder of 2.
The next digit of our result is 7. 
Result so far: 1411652.7
Subtract 448 from 450 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
20 divided by 64 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 1411652.7
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
64 can be fit into 200 3 times, resulting in a remainder of 8.
Write down 3 as next digit of the result. 
Result so far: 1411652.703
Subtracting 192 from 200 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 12:
80 divided by 64 is 1 with a remainder of 16.
The next digit of our result is 1. 
Result so far: 1411652.7031
Subtracting 64 from 80 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 13:
64 goes into 160 2 times with a remainder of 32.
Use 2 as the next digit of our solution. 
Result so far: 1411652.70312
The remainder is 32 after subtracting 128 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 14:
64 goes into 320 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 1411652.703125
Subtracting 320 from 320 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 15:
0 divided by 64 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1411652.703125
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 16:
64 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 1411652.703125
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 1411652.703125 with a remainder of 0.0.