78486 ÷ 8 = 9810 R6
Let's divide 78486 by 8.

Step 1:
8 goes into 7 0 times with a remainder of 7.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 7 to get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 8

Step 2:
8 goes into 78 9 times with a remainder of 6.
Write down 9 as next digit of of the result. 
Result so far: 9
Subtract 72 from 78 to get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 8

Step 3:
8 goes into 64 8 times with a remainder of 0.
Write down 8 as next digit of of the result. 
Result so far: 98
Subtract 64 from 64 to get 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 8

Step 4:
8 goes into 8 1 times with a remainder of 0.
Write down 1 as next digit of of the result. 
Result so far: 981
Subtract 8 from 8 to get 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 8

Step 5:
8 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of of the result. 
Result so far: 9810
Subtract 0 from 6 to get 6.

The final result is 9810 with a remainder of 6.