638987 ÷ 28 
We're looking to find how many times 28 goes into 638987.

On to step 1:
6 divided by 28 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 28

Step 2:
When dividing 63 by 28, we get 2 with a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 56 from 63 and we're left with 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 28

On to step 3:
When dividing 78 by 28, we get 2 with a remainder of 22.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
Subtracting 56 from 78 leaves us with 22.
Include the next digit (9) from the dividend after 22, then repeat: 229 / 28

Step 4:
28 can be fit into 229 8 times, resulting in a remainder of 5.
Record the quotient 8 as the next digit in the result. 
Result so far: 228.0
Subtract 224 from 229 to get 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 28

Going ahead to step 5:
When dividing 58 by 28, we get 2 with a remainder of 2.
The next digit of our result is 2. 
Result so far: 2282.0
The remainder is 2 after subtracting 56 from 58.
Include the next digit (7) from the dividend after 2, then repeat: 27 / 28

Going ahead to step 6:
28 goes into 27 0 times with a remainder of 27.
Write down 0 as next digit of the result. 
Result so far: 22820.0
If we subtract 0 from 27, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 7:
28 goes into 270 9 times with a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 22820.9
Subtract 252 from 270 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 8:
If we divide 180 by 28, we get 6 and a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 22820.96
Subtracting 168 from 180 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.

Going ahead to step 9:
28 goes into 120 4 times with a remainder of 8.
The next digit of our result is 4. 
Result so far: 22820.964
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.

Step 10:
The number 28 fits into 80 2 times, leaving a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 22820.9642
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.

Going ahead to step 11:
28 goes into 240 8 times with a remainder of 16.
The number 8 becomes the next digit in our result. 
Result so far: 22820.96428
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.

Let's proceed to step 12:
28 goes into 160 5 times with a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 22820.964285
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 13:
If we divide 200 by 28, we get 7 and a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 22820.9642857
Subtract 196 from 200 to get 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 14:
If we divide 40 by 28, we get 1 and a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 22820.96428571
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.

The quotient of the division is 22820.96428571, and the remainder is 1.2e-08.