639173 divided by 25 
We want to figure out the number of times 639173 can be divided by 25.

Let's proceed to step 1:
25 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 25

Step 2:
25 can be fit into 63 2 times, resulting in a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 50 from 63, we get 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 25

Let's proceed to step 3:
When dividing 139 by 25, we get 5 with a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 25.0
Deduct 125 from 139 and we're left with 14.
Fetch the next digit (1) from the dividend, attach it to 14 and continue: 141 / 25

Going ahead to step 4:
If we divide 141 by 25, we get 5 and a remainder of 16.
Use 5 as the next digit of our solution. 
Result so far: 255.0
The remainder is 16 after subtracting 125 from 141.
Fetch the next digit (7) from the dividend, attach it to 16 and continue: 167 / 25

Step 5:
25 goes into 167 6 times with a remainder of 17.
The number 6 becomes the next digit in our result. 
Result so far: 2556.0
If we take 150 away from 167, we end up with 17.
Take the next digit (3) from the dividend and append it to 17, then repeat: 173 / 25

Moving on to step 6:
The number 25 fits into 173 6 times, leaving a remainder of 23.
The next digit of our result is 6. 
Result so far: 25566.0
Subtract 150 from 173 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 7:
25 can be fit into 230 9 times, resulting in a remainder of 5.
The next digit of our result is 9. 
Result so far: 25566.9
Subtract 225 from 230 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
50 divided by 25 is 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 25566.92
Subtract 50 from 50 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
The number 25 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 25566.92
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
If we divide 0 by 25, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 25566.92
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 25566.92 with a remaining 0.0.