640604 ÷ 28 
Let's see how many times 28 fits into 640604.

Advancing to step 1:
6 divided by 28 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 28

Advancing to step 2:
The number 28 fits into 64 2 times, leaving a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 56 away from 64, we end up with 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 28

Advancing to step 3:
When dividing 80 by 28, we get 2 with a remainder of 24.
The next digit of our result is 2. 
Result so far: 22.0
If we take 56 away from 80, we end up with 24.
Include the next digit (6) from the dividend after 24, then repeat: 246 / 28

Moving on to step 4:
The number 28 fits into 246 8 times, leaving a remainder of 22.
Record the quotient 8 as the next digit in the result. 
Result so far: 228.0
Subtract 224 from 246 to get 22.
Grab the next digit (0) from the dividend, add it to 22, then carry on: 220 / 28

Going ahead to step 5:
28 goes into 220 7 times with a remainder of 24.
Use 7 as the next digit of our solution. 
Result so far: 2287.0
Subtracting 196 from 220 leaves us with 24.
Include the next digit (4) from the dividend after 24, then repeat: 244 / 28

Step 6:
If we divide 244 by 28, we get 8 and a remainder of 20.
Put 8 as the next digit of the answer. 
Result so far: 22878.0
The remainder is 20 after subtracting 224 from 244.
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 7:
The number 28 fits into 200 7 times, leaving a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 22878.7
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.

Advancing to step 8:
The number 28 fits into 40 1 times, leaving a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 22878.71
If we take 28 away from 40, we end up 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 9:
120 divided by 28 is 4 with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 22878.714
Subtracting 112 from 120 leaves us 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:
28 can be fit into 80 2 times, resulting in a remainder of 24.
The next digit of our result is 2. 
Result so far: 22878.7142
Deduct 56 from 80 and we're left 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.

Moving on to step 11:
When dividing 240 by 28, we get 8 with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 22878.71428
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 12:
28 can be fit into 160 5 times, resulting in a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 22878.714285
If we subtract 140 from 160, we 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 13:
28 can be fit into 200 7 times, resulting in a remainder of 4.
The next digit of our result is 7. 
Result so far: 22878.7142857
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.

Going ahead to step 14:
28 goes into 40 1 times with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 22878.71428571
The remainder is 12 after subtracting 28 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 22878.71428571 with a remainder of 1.2e-08.