We look at the division of 51890532 by 728 
The aim is to understand the frequency of 728 in 51890532.

On to step 1:
When dividing 5 by 728, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 728

Step 2:
If we divide 51 by 728, we get 0 and a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Bring next digit (8) of the dividend behind the 51 and repeat the process: 518 / 728

Let's proceed to step 3:
728 goes into 518 0 times with a remainder of 518.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 518 to get 518.
Take the next digit (9) from the dividend and append it to 518, then repeat: 5189 / 728

Moving on to step 4:
728 can be fit into 5189 7 times, resulting in a remainder of 93.
The next digit of our result is 7. 
Result so far: 7.0
If we subtract 5096 from 5189, we get 93.
Include the next digit (0) from the dividend after 93, then repeat: 930 / 728

Moving on to step 5:
728 goes into 930 1 times with a remainder of 202.
Put 1 as the next digit of the answer. 
Result so far: 71.0
If we subtract 728 from 930, we get 202.
Bring next digit (5) of the dividend behind the 202 and repeat the process: 2025 / 728

Let's proceed to step 6:
If we divide 2025 by 728, we get 2 and a remainder of 569.
Record the quotient 2 as the next digit in the result. 
Result so far: 712.0
If we take 1456 away from 2025, we end up with 569.
Grab the next digit (3) from the dividend, add it to 569, then carry on: 5693 / 728

Step 7:
When dividing 5693 by 728, we get 7 with a remainder of 597.
Use 7 as the next digit of our solution. 
Result so far: 7127.0
The remainder is 597 after subtracting 5096 from 5693.
Include the next digit (2) from the dividend after 597, then repeat: 5972 / 728

On to step 8:
The number 728 fits into 5972 8 times, leaving a remainder of 148.
Use 8 as the next digit of our solution. 
Result so far: 71278.0
Subtract 5824 from 5972 to get 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Advancing to step 9:
728 goes into 1480 2 times with a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 71278.2
If we subtract 1456 from 1480, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 10:
240 divided by 728 is 0 with a remainder of 240.
The number 0 becomes the next digit in our result. 
Result so far: 71278.2
Subtracting 0 from 240 leaves us with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Advancing to step 11:
728 goes into 2400 3 times with a remainder of 216.
Put 3 as the next digit of the answer. 
Result so far: 71278.203
Subtract 2184 from 2400 to get 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Step 12:
If we divide 2160 by 728, we get 2 and a remainder of 704.
Use 2 as the next digit of our solution. 
Result so far: 71278.2032
Subtracting 1456 from 2160 leaves us with 704.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7040, and continue the process.

Step 13:
7040 divided by 728 is 9 with a remainder of 488.
Use 9 as the next digit of our solution. 
Result so far: 71278.20329
Subtracting 6552 from 7040 leaves us with 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

Let's proceed to step 14:
When dividing 4880 by 728, we get 6 with a remainder of 512.
Write down 6 as next digit of the result. 
Result so far: 71278.203296
If we take 4368 away from 4880, we end up with 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

On to step 15:
When dividing 5120 by 728, we get 7 with a remainder of 24.
The next digit of our result is 7. 
Result so far: 71278.2032967
If we take 5096 away from 5120, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 16:
The number 728 fits into 240 0 times, leaving a remainder of 240.
The number 0 becomes the next digit in our result. 
Result so far: 71278.2032967
Deduct 0 from 240 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The quotient of the division is 71278.2032967, and the remainder is 2.4e-07.