639850 ÷ 28 
The aim is to understand the frequency of 28 in 639850.

Advancing to step 1:
28 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 28

Let's proceed to step 2:
28 goes into 63 2 times with a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 56 from 63 leaves us with 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 28

Step 3:
28 can be fit into 79 2 times, resulting in a remainder of 23.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
The remainder is 23 after subtracting 56 from 79.
Fetch the next digit (8) from the dividend, attach it to 23 and continue: 238 / 28

Moving on to step 4:
28 goes into 238 8 times with a remainder of 14.
Use 8 as the next digit of our solution. 
Result so far: 228.0
If we take 224 away from 238, we end up with 14.
Fetch the next digit (5) from the dividend, attach it to 14 and continue: 145 / 28

Advancing to step 5:
28 can be fit into 145 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 2285.0
If we subtract 140 from 145, we get 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 28

Step 6:
28 goes into 50 1 times with a remainder of 22.
The number 1 becomes the next digit in our result. 
Result so far: 22851.0
Subtract 28 from 50 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 7:
The number 28 fits into 220 7 times, leaving a remainder of 24.
The next digit of our result is 7. 
Result so far: 22851.7
Subtracting 196 from 220 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.

Step 8:
28 can be fit into 240 8 times, resulting in a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 22851.78
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 9:
28 goes into 160 5 times with a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 22851.785
Deduct 140 from 160 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
The number 28 fits into 200 7 times, leaving a remainder of 4.
Record the quotient 7 as the next digit in the result. 
Result so far: 22851.7857
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.

Let's proceed to step 11:
28 can be fit into 40 1 times, resulting in a remainder of 12.
The next digit of our result is 1. 
Result so far: 22851.78571
Subtract 28 from 40 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 12:
28 goes into 120 4 times with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 22851.785714
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.

On to step 13:
80 divided by 28 is 2 with a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 22851.7857142
If we subtract 56 from 80, 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 14:
When dividing 240 by 28, we get 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 22851.78571428
The remainder is 16 after subtracting 224 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

In conclusion, the division gives 22851.78571428 with a balance of 1.6e-08.