17212728 divided by 645 
We want to divide 17212728 by 645.

Advancing to step 1:
1 divided by 645 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 645

Moving on to step 2:
17 divided by 645 is 0 with a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 17 after subtracting 0 from 17.
Include the next digit (2) from the dividend after 17, then repeat: 172 / 645

Step 3:
645 can be fit into 172 0 times, resulting in a remainder of 172.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 172 to get 172.
Bring next digit (1) of the dividend behind the 172 and repeat the process: 1721 / 645

Step 4:
The number 645 fits into 1721 2 times, leaving a remainder of 431.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 1290 from 1721, we get 431.
Take the next digit (2) from the dividend and append it to 431, then repeat: 4312 / 645

Let's proceed to step 5:
If we divide 4312 by 645, we get 6 and a remainder of 442.
Write down 6 as next digit of the result. 
Result so far: 26.0
Subtract 3870 from 4312 to get 442.
Bring next digit (7) of the dividend behind the 442 and repeat the process: 4427 / 645

On to step 6:
645 can be fit into 4427 6 times, resulting in a remainder of 557.
Use 6 as the next digit of our solution. 
Result so far: 266.0
Subtracting 3870 from 4427 leaves us with 557.
Append the next digit (2) from the dividend to 557 and continue with: 5572 / 645

Going ahead to step 7:
If we divide 5572 by 645, we get 8 and a remainder of 412.
Put 8 as the next digit of the answer. 
Result so far: 2668.0
If we take 5160 away from 5572, we end up with 412.
Grab the next digit (8) from the dividend, add it to 412, then carry on: 4128 / 645

Advancing to step 8:
645 goes into 4128 6 times with a remainder of 258.
The number 6 becomes the next digit in our result. 
Result so far: 26686.0
Deduct 3870 from 4128 and we're left with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Going ahead to step 9:
The number 645 fits into 2580 4 times, leaving a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 26686.4
Deduct 2580 from 2580 and we're left 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.

Moving on to step 10:
0 divided by 645 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 26686.4
If we take 0 away from 0, we end up 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.

Moving on to step 11:
The number 645 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 26686.4
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 26686.4 with a remaining 0.0.