86989 ÷ 8 = 10873 R5
Alright, let's work through the division of 86989 by 8 step by step.

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

Step 2:
8 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of of the result. 
Result so far: 10
Subtract 0 from 6 to get 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 8

Step 3:
8 goes into 69 8 times with a remainder of 5.
Write down 8 as next digit of of the result. 
Result so far: 108
Subtract 64 from 69 to get 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 8

Step 4:
8 goes into 58 7 times with a remainder of 2.
Write down 7 as next digit of of the result. 
Result so far: 1087
Subtract 56 from 58 to get 2.
Bring next digit (9) of the dividend behind the 2 and repeat the process: 29 / 8

Step 5:
8 goes into 29 3 times with a remainder of 5.
Write down 3 as next digit of of the result. 
Result so far: 10873
Subtract 24 from 29 to get 5.

The final result is 10873 with a remainder of 5.