509643 divided by 86 
Let's see how many times 86 fits into 509643.

Going ahead to step 1:
The number 86 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (0) of the dividend behind the 5 and repeat the process: 50 / 86

Going ahead to step 2:
The number 86 fits into 50 0 times, leaving a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 50 leaves us with 50.
Include the next digit (9) from the dividend after 50, then repeat: 509 / 86

Step 3:
The number 86 fits into 509 5 times, leaving a remainder of 79.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 79 after subtracting 430 from 509.
Append the next digit (6) from the dividend to 79 and continue with: 796 / 86

On to step 4:
796 divided by 86 is 9 with a remainder of 22.
The next digit of our result is 9. 
Result so far: 59.0
The remainder is 22 after subtracting 774 from 796.
Include the next digit (4) from the dividend after 22, then repeat: 224 / 86

Going ahead to step 5:
When dividing 224 by 86, we get 2 with a remainder of 52.
The next digit of our result is 2. 
Result so far: 592.0
Deduct 172 from 224 and we're left with 52.
Bring next digit (3) of the dividend behind the 52 and repeat the process: 523 / 86

Moving on to step 6:
If we divide 523 by 86, we get 6 and a remainder of 7.
Put 6 as the next digit of the answer. 
Result so far: 5926.0
Deduct 516 from 523 and we're left 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.

On to step 7:
The number 86 fits into 70 0 times, leaving a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 5926.0
Subtract 0 from 70 to 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.

On to step 8:
700 divided by 86 is 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 5926.08
If we take 688 away from 700, we end up with 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 9:
When dividing 120 by 86, we get 1 with a remainder of 34.
Put 1 as the next digit of the answer. 
Result so far: 5926.081
If we take 86 away from 120, we end up 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.

Moving on to step 10:
340 divided by 86 is 3 with a remainder of 82.
Put 3 as the next digit of the answer. 
Result so far: 5926.0813
Subtract 258 from 340 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 11:
The number 86 fits into 820 9 times, leaving a remainder of 46.
Put 9 as the next digit of the answer. 
Result so far: 5926.08139
Deduct 774 from 820 and we're left 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.

Moving on to step 12:
The number 86 fits into 460 5 times, leaving a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 5926.081395
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.

Step 13:
86 goes into 300 3 times with a remainder of 42.
The next digit of our result is 3. 
Result so far: 5926.0813953
If we subtract 258 from 300, we get 42.
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 14:
If we divide 420 by 86, we get 4 and a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 5926.08139534
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 outcome is 5926.08139534, with a leftover of 7.6e-08.