86401646 divided by 459 
Our goal is to divide 86401646 by 459.

Moving on to step 1:
When dividing 8 by 459, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 459

On to step 2:
If we divide 86 by 459, we get 0 and a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Include the next digit (4) from the dividend after 86, then repeat: 864 / 459

Advancing to step 3:
864 divided by 459 is 1 with a remainder of 405.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 405 after subtracting 459 from 864.
Include the next digit (0) from the dividend after 405, then repeat: 4050 / 459

Going ahead to step 4:
The number 459 fits into 4050 8 times, leaving a remainder of 378.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
Subtracting 3672 from 4050 leaves us with 378.
Include the next digit (1) from the dividend after 378, then repeat: 3781 / 459

On to step 5:
When dividing 3781 by 459, we get 8 with a remainder of 109.
The number 8 becomes the next digit in our result. 
Result so far: 188.0
Deduct 3672 from 3781 and we're left with 109.
Fetch the next digit (6) from the dividend, attach it to 109 and continue: 1096 / 459

Let's proceed to step 6:
459 goes into 1096 2 times with a remainder of 178.
Write down 2 as next digit of the result. 
Result so far: 1882.0
If we take 918 away from 1096, we end up with 178.
Append the next digit (4) from the dividend to 178 and continue with: 1784 / 459

Going ahead to step 7:
If we divide 1784 by 459, we get 3 and a remainder of 407.
Write down 3 as next digit of the result. 
Result so far: 18823.0
If we take 1377 away from 1784, we end up with 407.
Bring next digit (6) of the dividend behind the 407 and repeat the process: 4076 / 459

Advancing to step 8:
459 goes into 4076 8 times with a remainder of 404.
Put 8 as the next digit of the answer. 
Result so far: 188238.0
If we take 3672 away from 4076, we end up with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Let's proceed to step 9:
If we divide 4040 by 459, we get 8 and a remainder of 368.
Record the quotient 8 as the next digit in the result. 
Result so far: 188238.8
If we take 3672 away from 4040, we end up with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Moving on to step 10:
459 goes into 3680 8 times with a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 188238.88
The remainder is 8 after subtracting 3672 from 3680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 188238.88 with a remainder of 0.008.