86423401 ÷ 8 
Let's see how many times 8 fits into 86423401.

On to step 1:
8 goes into 8 1 times with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 8 from 8, we get 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 8

Let's proceed to step 2:
6 divided by 8 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 8

Let's proceed to step 3:
8 goes into 64 8 times with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 108.0
If we take 64 away from 64, we end up with 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 8

Going ahead to step 4:
8 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 1080.0
Subtract 0 from 2 to get 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 8

Step 5:
When dividing 23 by 8, we get 2 with a remainder of 7.
The next digit of our result is 2. 
Result so far: 10802.0
The remainder is 7 after subtracting 16 from 23.
Fetch the next digit (4) from the dividend, attach it to 7 and continue: 74 / 8

Going ahead to step 6:
74 divided by 8 is 9 with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 108029.0
Subtract 72 from 74 to get 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 8

Going ahead to step 7:
The number 8 fits into 20 2 times, leaving a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 1080292.0
If we subtract 16 from 20, we get 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 8

On to step 8:
The number 8 fits into 41 5 times, leaving a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 10802925.0
If we take 40 away from 41, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 9:
8 can be fit into 10 1 times, resulting in a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 10802925.1
If we take 8 away from 10, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 10:
8 goes into 20 2 times with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 10802925.12
If we subtract 16 from 20, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 11:
When dividing 40 by 8, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 10802925.125
The remainder is 0 after subtracting 40 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 12:
0 divided by 8 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10802925.125
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 13:
8 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 10802925.125
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 10802925.125 with a balance of 0.0.