551868 ÷ 28 
The aim is to understand the frequency of 28 in 551868.

Step 1:
When dividing 5 by 28, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 28

Advancing to step 2:
When dividing 55 by 28, we get 1 with a remainder of 27.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 28 from 55 to get 27.
Bring next digit (1) of the dividend behind the 27 and repeat the process: 271 / 28

Going ahead to step 3:
28 can be fit into 271 9 times, resulting in a remainder of 19.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
If we subtract 252 from 271, we get 19.
Grab the next digit (8) from the dividend, add it to 19, then carry on: 198 / 28

Advancing to step 4:
28 goes into 198 7 times with a remainder of 2.
The next digit of our result is 7. 
Result so far: 197.0
Subtract 196 from 198 to get 2.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 28

Moving on to step 5:
28 goes into 26 0 times with a remainder of 26.
The number 0 becomes the next digit in our result. 
Result so far: 1970.0
Deduct 0 from 26 and we're left with 26.
Fetch the next digit (8) from the dividend, attach it to 26 and continue: 268 / 28

Advancing to step 6:
The number 28 fits into 268 9 times, leaving a remainder of 16.
The number 9 becomes the next digit in our result. 
Result so far: 19709.0
If we take 252 away from 268, we end up 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.

Let's proceed to step 7:
28 can be fit into 160 5 times, resulting in a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 19709.5
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 8:
If we divide 200 by 28, we get 7 and a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 19709.57
Subtracting 196 from 200 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.

On to step 9:
The number 28 fits into 40 1 times, leaving a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 19709.571
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 10:
120 divided by 28 is 4 with a remainder of 8.
The next digit of our result is 4. 
Result so far: 19709.5714
Subtract 112 from 120 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 11:
28 goes into 80 2 times with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 19709.57142
If we take 56 away from 80, 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.

Advancing to step 12:
28 goes into 240 8 times with a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 19709.571428
Subtract 224 from 240 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.

Step 13:
If we divide 160 by 28, we get 5 and a remainder of 20.
The number 5 becomes the next digit in our result. 
Result so far: 19709.5714285
Subtract 140 from 160 to get 20.
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 14:
When dividing 200 by 28, we get 7 with a remainder of 4.
The next digit of our result is 7. 
Result so far: 19709.57142857
If we take 196 away from 200, we end up 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.

The final result is 19709.57142857 with a remainder of 4e-09.