64390641 ÷ 716 
We want to figure out the number of times 64390641 can be divided by 716.

Step 1:
When dividing 6 by 716, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 716

Moving on to step 2:
The number 716 fits into 64 0 times, leaving a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Include the next digit (3) from the dividend after 64, then repeat: 643 / 716

Advancing to step 3:
When dividing 643 by 716, we get 0 with a remainder of 643.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 643, we get 643.
Append the next digit (9) from the dividend to 643 and continue with: 6439 / 716

Step 4:
716 can be fit into 6439 8 times, resulting in a remainder of 711.
The next digit of our result is 8. 
Result so far: 8.0
If we subtract 5728 from 6439, we get 711.
Include the next digit (0) from the dividend after 711, then repeat: 7110 / 716

On to step 5:
When dividing 7110 by 716, we get 9 with a remainder of 666.
Use 9 as the next digit of our solution. 
Result so far: 89.0
If we take 6444 away from 7110, we end up with 666.
Bring next digit (6) of the dividend behind the 666 and repeat the process: 6666 / 716

On to step 6:
If we divide 6666 by 716, we get 9 and a remainder of 222.
Write down 9 as next digit of the result. 
Result so far: 899.0
If we take 6444 away from 6666, we end up with 222.
Append the next digit (4) from the dividend to 222 and continue with: 2224 / 716

Let's proceed to step 7:
When dividing 2224 by 716, we get 3 with a remainder of 76.
Put 3 as the next digit of the answer. 
Result so far: 8993.0
Subtracting 2148 from 2224 leaves us with 76.
Grab the next digit (1) from the dividend, add it to 76, then carry on: 761 / 716

On to step 8:
When dividing 761 by 716, we get 1 with a remainder of 45.
Record the quotient 1 as the next digit in the result. 
Result so far: 89931.0
If we take 716 away from 761, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 9:
When dividing 450 by 716, we get 0 with a remainder of 450.
The number 0 becomes the next digit in our result. 
Result so far: 89931.0
Subtracting 0 from 450 leaves us with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Going ahead to step 10:
716 can be fit into 4500 6 times, resulting in a remainder of 204.
The number 6 becomes the next digit in our result. 
Result so far: 89931.06
Subtract 4296 from 4500 to get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Going ahead to step 11:
716 can be fit into 2040 2 times, resulting in a remainder of 608.
Write down 2 as next digit of the result. 
Result so far: 89931.062
Deduct 1432 from 2040 and we're left with 608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Moving on to step 12:
716 can be fit into 6080 8 times, resulting in a remainder of 352.
Use 8 as the next digit of our solution. 
Result so far: 89931.0628
If we subtract 5728 from 6080, we get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Let's proceed to step 13:
The number 716 fits into 3520 4 times, leaving a remainder of 656.
Put 4 as the next digit of the answer. 
Result so far: 89931.06284
The remainder is 656 after subtracting 2864 from 3520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6560, and continue the process.

On to step 14:
The number 716 fits into 6560 9 times, leaving a remainder of 116.
The next digit of our result is 9. 
Result so far: 89931.062849
The remainder is 116 after subtracting 6444 from 6560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Let's proceed to step 15:
If we divide 1160 by 716, we get 1 and a remainder of 444.
Put 1 as the next digit of the answer. 
Result so far: 89931.0628491
Subtract 716 from 1160 to get 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

Moving on to step 16:
4440 divided by 716 is 6 with a remainder of 144.
Write down 6 as next digit of the result. 
Result so far: 89931.06284916
Deduct 4296 from 4440 and we're left with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

The final result is 89931.06284916 with a remainder of 1.44e-07.