64171650 divided by 90 
Our goal is to divide 64171650 by 90.

Advancing to step 1:
6 divided by 90 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 90

Going ahead to step 2:
90 can be fit into 64 0 times, resulting in a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Include the next digit (1) from the dividend after 64, then repeat: 641 / 90

Moving on to step 3:
90 can be fit into 641 7 times, resulting in a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we take 630 away from 641, we end up with 11.
Include the next digit (7) from the dividend after 11, then repeat: 117 / 90

Moving on to step 4:
If we divide 117 by 90, we get 1 and a remainder of 27.
Put 1 as the next digit of the answer. 
Result so far: 71.0
The remainder is 27 after subtracting 90 from 117.
Grab the next digit (1) from the dividend, add it to 27, then carry on: 271 / 90

Moving on to step 5:
90 can be fit into 271 3 times, resulting in a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 713.0
Subtracting 270 from 271 leaves us with 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 90

Moving on to step 6:
90 goes into 16 0 times with a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 7130.0
If we subtract 0 from 16, we get 16.
Grab the next digit (5) from the dividend, add it to 16, then carry on: 165 / 90

Advancing to step 7:
If we divide 165 by 90, we get 1 and a remainder of 75.
Use 1 as the next digit of our solution. 
Result so far: 71301.0
Subtract 90 from 165 to get 75.
Append the next digit (0) from the dividend to 75 and continue with: 750 / 90

Let's proceed to step 8:
If we divide 750 by 90, we get 8 and a remainder of 30.
Write down 8 as next digit of the result. 
Result so far: 713018.0
Subtract 720 from 750 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 9:
90 goes into 300 3 times with a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 713018.3
Subtracting 270 from 300 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 10:
90 can be fit into 300 3 times, resulting in a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 713018.33
If we take 270 away from 300, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 713018.33 with a remainder of 0.03.