836571 divided by 28 
The aim is to understand the frequency of 28 in 836571.

Step 1:
If we divide 8 by 28, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 28

Step 2:
The number 28 fits into 83 2 times, leaving a remainder of 27.
Write down 2 as next digit of the result. 
Result so far: 2.0
The remainder is 27 after subtracting 56 from 83.
Include the next digit (6) from the dividend after 27, then repeat: 276 / 28

Moving on to step 3:
When dividing 276 by 28, we get 9 with a remainder of 24.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Subtract 252 from 276 to get 24.
Grab the next digit (5) from the dividend, add it to 24, then carry on: 245 / 28

Let's proceed to step 4:
If we divide 245 by 28, we get 8 and a remainder of 21.
Put 8 as the next digit of the answer. 
Result so far: 298.0
If we take 224 away from 245, we end up with 21.
Grab the next digit (7) from the dividend, add it to 21, then carry on: 217 / 28

Going ahead to step 5:
28 goes into 217 7 times with a remainder of 21.
Put 7 as the next digit of the answer. 
Result so far: 2987.0
The remainder is 21 after subtracting 196 from 217.
Bring next digit (1) of the dividend behind the 21 and repeat the process: 211 / 28

On to step 6:
211 divided by 28 is 7 with a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 29877.0
If we subtract 196 from 211, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 7:
28 can be fit into 150 5 times, resulting in a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 29877.5
Deduct 140 from 150 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
When dividing 100 by 28, we get 3 with a remainder of 16.
Record the quotient 3 as the next digit in the result. 
Result so far: 29877.53
Subtract 84 from 100 to 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.

On to step 9:
28 goes into 160 5 times with a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 29877.535
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.

Moving on to step 10:
28 goes into 200 7 times with a remainder of 4.
Put 7 as the next digit of the answer. 
Result so far: 29877.5357
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.

Going ahead to step 11:
The number 28 fits into 40 1 times, leaving a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 29877.53571
Subtracting 28 from 40 leaves us 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.

Advancing to step 12:
If we divide 120 by 28, we get 4 and a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 29877.535714
Deduct 112 from 120 and we're left 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.

On to step 13:
If we divide 80 by 28, we get 2 and a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 29877.5357142
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.

Going ahead to step 14:
28 can be fit into 240 8 times, resulting in a remainder of 16.
The next digit of our result is 8. 
Result so far: 29877.53571428
Subtracting 224 from 240 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.

The final result is 29877.53571428 with a remainder of 1.6e-08.