87831613 ÷ 28 
The aim is to understand the frequency of 28 in 87831613.

Moving on to step 1:
8 divided by 28 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 28

Moving on to step 2:
87 divided by 28 is 3 with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 84 from 87 and we're left with 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 28

Advancing to step 3:
When dividing 38 by 28, we get 1 with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 31.0
Deduct 28 from 38 and we're left with 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 28

Moving on to step 4:
If we divide 103 by 28, we get 3 and a remainder of 19.
Record the quotient 3 as the next digit in the result. 
Result so far: 313.0
If we subtract 84 from 103, we get 19.
Bring next digit (1) of the dividend behind the 19 and repeat the process: 191 / 28

On to step 5:
28 can be fit into 191 6 times, resulting in a remainder of 23.
Record the quotient 6 as the next digit in the result. 
Result so far: 3136.0
If we take 168 away from 191, we end up with 23.
Take the next digit (6) from the dividend and append it to 23, then repeat: 236 / 28

Let's proceed to step 6:
If we divide 236 by 28, we get 8 and a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 31368.0
Subtract 224 from 236 to get 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 28

Advancing to step 7:
121 divided by 28 is 4 with a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 313684.0
Subtracting 112 from 121 leaves us with 9.
Bring next digit (3) of the dividend behind the 9 and repeat the process: 93 / 28

Moving on to step 8:
28 can be fit into 93 3 times, resulting in a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 3136843.0
Subtract 84 from 93 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 9:
When dividing 90 by 28, we get 3 with a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 3136843.3
Subtract 84 from 90 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.

Going ahead to step 10:
The number 28 fits into 60 2 times, leaving a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 3136843.32
Subtracting 56 from 60 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
40 divided by 28 is 1 with a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 3136843.321
Deduct 28 from 40 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 12:
If we divide 120 by 28, we get 4 and a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 3136843.3214
If we take 112 away from 120, we end up 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.

Let's proceed to step 13:
28 goes into 80 2 times with a remainder of 24.
The next digit of our result is 2. 
Result so far: 3136843.32142
Subtracting 56 from 80 leaves us 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.

Let's proceed to step 14:
The number 28 fits into 240 8 times, leaving a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 3136843.321428
If we subtract 224 from 240, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 15:
If we divide 160 by 28, we get 5 and a remainder of 20.
The next digit of our result is 5. 
Result so far: 3136843.3214285
The remainder is 20 after subtracting 140 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 16:
200 divided by 28 is 7 with a remainder of 4.
The next digit of our result is 7. 
Result so far: 3136843.32142857
The remainder is 4 after subtracting 196 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 3136843.32142857 with a remainder of 4e-09.