We're dividing 8628064 by 816 
The aim is to understand the frequency of 816 in 8628064.

Step 1:
When dividing 8 by 816, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 816

Step 2:
If we divide 86 by 816, we get 0 and a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 86 and we're left with 86.
Include the next digit (2) from the dividend after 86, then repeat: 862 / 816

Let's proceed to step 3:
816 goes into 862 1 times with a remainder of 46.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 46 after subtracting 816 from 862.
Include the next digit (8) from the dividend after 46, then repeat: 468 / 816

Advancing to step 4:
816 goes into 468 0 times with a remainder of 468.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtract 0 from 468 to get 468.
Bring next digit (0) of the dividend behind the 468 and repeat the process: 4680 / 816

On to step 5:
816 goes into 4680 5 times with a remainder of 600.
Record the quotient 5 as the next digit in the result. 
Result so far: 105.0
The remainder is 600 after subtracting 4080 from 4680.
Include the next digit (6) from the dividend after 600, then repeat: 6006 / 816

Moving on to step 6:
The number 816 fits into 6006 7 times, leaving a remainder of 294.
Record the quotient 7 as the next digit in the result. 
Result so far: 1057.0
If we take 5712 away from 6006, we end up with 294.
Bring next digit (4) of the dividend behind the 294 and repeat the process: 2944 / 816

Advancing to step 7:
When dividing 2944 by 816, we get 3 with a remainder of 496.
Record the quotient 3 as the next digit in the result. 
Result so far: 10573.0
Subtract 2448 from 2944 to get 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Moving on to step 8:
If we divide 4960 by 816, we get 6 and a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 10573.6
Subtract 4896 from 4960 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 9:
When dividing 640 by 816, we get 0 with a remainder of 640.
Put 0 as the next digit of the answer. 
Result so far: 10573.6
Deduct 0 from 640 and we're left with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Advancing to step 10:
When dividing 6400 by 816, we get 7 with a remainder of 688.
Use 7 as the next digit of our solution. 
Result so far: 10573.607
The remainder is 688 after subtracting 5712 from 6400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6880, and continue the process.

On to step 11:
When dividing 6880 by 816, we get 8 with a remainder of 352.
The next digit of our result is 8. 
Result so far: 10573.6078
Subtract 6528 from 6880 to get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

On to step 12:
When dividing 3520 by 816, we get 4 with a remainder of 256.
Use 4 as the next digit of our solution. 
Result so far: 10573.60784
Subtract 3264 from 3520 to get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Moving on to step 13:
816 goes into 2560 3 times with a remainder of 112.
Use 3 as the next digit of our solution. 
Result so far: 10573.607843
If we subtract 2448 from 2560, we get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

On to step 14:
The number 816 fits into 1120 1 times, leaving a remainder of 304.
The next digit of our result is 1. 
Result so far: 10573.6078431
The remainder is 304 after subtracting 816 from 1120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Going ahead to step 15:
816 goes into 3040 3 times with a remainder of 592.
The number 3 becomes the next digit in our result. 
Result so far: 10573.60784313
Deduct 2448 from 3040 and we're left 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.

Our division results in 10573.60784313 with a remaining 5.92e-07.