64020643 ÷ 86 
Let's see how many times 86 fits into 64020643.

Going ahead to step 1:
86 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 86

Going ahead to step 2:
64 divided by 86 is 0 with a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Fetch the next digit (0) from the dividend, attach it to 64 and continue: 640 / 86

Advancing to step 3:
86 can be fit into 640 7 times, resulting in a remainder of 38.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we take 602 away from 640, we end up with 38.
Take the next digit (2) from the dividend and append it to 38, then repeat: 382 / 86

Step 4:
86 can be fit into 382 4 times, resulting in a remainder of 38.
The number 4 becomes the next digit in our result. 
Result so far: 74.0
If we subtract 344 from 382, we get 38.
Take the next digit (0) from the dividend and append it to 38, then repeat: 380 / 86

Moving on to step 5:
When dividing 380 by 86, we get 4 with a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 744.0
Deduct 344 from 380 and we're left with 36.
Take the next digit (6) from the dividend and append it to 36, then repeat: 366 / 86

On to step 6:
If we divide 366 by 86, we get 4 and a remainder of 22.
Write down 4 as next digit of the result. 
Result so far: 7444.0
Subtracting 344 from 366 leaves us with 22.
Append the next digit (4) from the dividend to 22 and continue with: 224 / 86

On to step 7:
The number 86 fits into 224 2 times, leaving a remainder of 52.
The number 2 becomes the next digit in our result. 
Result so far: 74442.0
The remainder is 52 after subtracting 172 from 224.
Bring next digit (3) of the dividend behind the 52 and repeat the process: 523 / 86

Let's proceed to step 8:
If we divide 523 by 86, we get 6 and a remainder of 7.
Use 6 as the next digit of our solution. 
Result so far: 744426.0
If we take 516 away from 523, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 9:
86 goes into 70 0 times with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 744426.0
If we subtract 0 from 70, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 10:
The number 86 fits into 700 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 744426.08
If we subtract 688 from 700, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 11:
If we divide 120 by 86, we get 1 and a remainder of 34.
The next digit of our result is 1. 
Result so far: 744426.081
Subtracting 86 from 120 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 12:
The number 86 fits into 340 3 times, leaving a remainder of 82.
Put 3 as the next digit of the answer. 
Result so far: 744426.0813
The remainder is 82 after subtracting 258 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Step 13:
86 goes into 820 9 times with a remainder of 46.
The next digit of our result is 9. 
Result so far: 744426.08139
If we take 774 away from 820, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 14:
The number 86 fits into 460 5 times, leaving a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 744426.081395
Deduct 430 from 460 and we're left 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.

Advancing to step 15:
86 goes into 300 3 times with a remainder of 42.
Put 3 as the next digit of the answer. 
Result so far: 744426.0813953
The remainder is 42 after subtracting 258 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 16:
420 divided by 86 is 4 with a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 744426.08139534
Subtracting 344 from 420 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The final result is 744426.08139534 with a remainder of 7.6e-08.