17580939 divided by 648 
Our goal is to divide 17580939 by 648.

Moving on to step 1:
The number 648 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 648

On to step 2:
17 divided by 648 is 0 with a remainder of 17.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 17 leaves us with 17.
Grab the next digit (5) from the dividend, add it to 17, then carry on: 175 / 648

Going ahead to step 3:
When dividing 175 by 648, we get 0 with a remainder of 175.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 175 and we're left with 175.
Grab the next digit (8) from the dividend, add it to 175, then carry on: 1758 / 648

Advancing to step 4:
648 goes into 1758 2 times with a remainder of 462.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 1296 from 1758 to get 462.
Include the next digit (0) from the dividend after 462, then repeat: 4620 / 648

On to step 5:
4620 divided by 648 is 7 with a remainder of 84.
Use 7 as the next digit of our solution. 
Result so far: 27.0
If we subtract 4536 from 4620, we get 84.
Include the next digit (9) from the dividend after 84, then repeat: 849 / 648

Step 6:
648 goes into 849 1 times with a remainder of 201.
Write down 1 as next digit of the result. 
Result so far: 271.0
If we subtract 648 from 849, we get 201.
Fetch the next digit (3) from the dividend, attach it to 201 and continue: 2013 / 648

On to step 7:
When dividing 2013 by 648, we get 3 with a remainder of 69.
Write down 3 as next digit of the result. 
Result so far: 2713.0
Deduct 1944 from 2013 and we're left with 69.
Bring next digit (9) of the dividend behind the 69 and repeat the process: 699 / 648

Going ahead to step 8:
648 can be fit into 699 1 times, resulting in a remainder of 51.
Record the quotient 1 as the next digit in the result. 
Result so far: 27131.0
Subtract 648 from 699 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Let's proceed to step 9:
If we divide 510 by 648, we get 0 and a remainder of 510.
Write down 0 as next digit of the result. 
Result so far: 27131.0
If we take 0 away from 510, we end up with 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

On to step 10:
648 can be fit into 5100 7 times, resulting in a remainder of 564.
Record the quotient 7 as the next digit in the result. 
Result so far: 27131.07
If we take 4536 away from 5100, we end up with 564.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5640, and continue the process.

On to step 11:
5640 divided by 648 is 8 with a remainder of 456.
The number 8 becomes the next digit in our result. 
Result so far: 27131.078
Subtract 5184 from 5640 to get 456.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4560, and continue the process.

Going ahead to step 12:
648 can be fit into 4560 7 times, resulting in a remainder of 24.
Record the quotient 7 as the next digit in the result. 
Result so far: 27131.0787
Deduct 4536 from 4560 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 13:
648 goes into 240 0 times with a remainder of 240.
The next digit of our result is 0. 
Result so far: 27131.0787
Subtract 0 from 240 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 14:
648 can be fit into 2400 3 times, resulting in a remainder of 456.
Put 3 as the next digit of the answer. 
Result so far: 27131.078703
Deduct 1944 from 2400 and we're left with 456.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4560, and continue the process.

Going ahead to step 15:
648 goes into 4560 7 times with a remainder of 24.
Write down 7 as next digit of the result. 
Result so far: 27131.0787037
Subtract 4536 from 4560 to 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.

Advancing to step 16:
648 goes into 240 0 times with a remainder of 240.
The next digit of our result is 0. 
Result so far: 27131.0787037
The remainder is 240 after subtracting 0 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The final outcome is 27131.0787037, with a leftover of 2.4e-07.