86791629 divided by 978 
We want to figure out the number of times 86791629 can be divided by 978.

Advancing to step 1:
The number 978 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 978

Advancing to step 2:
978 can be fit into 86 0 times, resulting in a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Grab the next digit (7) from the dividend, add it to 86, then carry on: 867 / 978

Step 3:
When dividing 867 by 978, we get 0 with a remainder of 867.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 867 and we're left with 867.
Append the next digit (9) from the dividend to 867 and continue with: 8679 / 978

Going ahead to step 4:
When dividing 8679 by 978, we get 8 with a remainder of 855.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 7824 away from 8679, we end up with 855.
Grab the next digit (1) from the dividend, add it to 855, then carry on: 8551 / 978

Moving on to step 5:
978 can be fit into 8551 8 times, resulting in a remainder of 727.
Put 8 as the next digit of the answer. 
Result so far: 88.0
If we subtract 7824 from 8551, we get 727.
Grab the next digit (6) from the dividend, add it to 727, then carry on: 7276 / 978

Step 6:
978 goes into 7276 7 times with a remainder of 430.
Put 7 as the next digit of the answer. 
Result so far: 887.0
Deduct 6846 from 7276 and we're left with 430.
Grab the next digit (2) from the dividend, add it to 430, then carry on: 4302 / 978

Let's proceed to step 7:
If we divide 4302 by 978, we get 4 and a remainder of 390.
Record the quotient 4 as the next digit in the result. 
Result so far: 8874.0
Deduct 3912 from 4302 and we're left with 390.
Bring next digit (9) of the dividend behind the 390 and repeat the process: 3909 / 978

Going ahead to step 8:
3909 divided by 978 is 3 with a remainder of 975.
Record the quotient 3 as the next digit in the result. 
Result so far: 88743.0
If we subtract 2934 from 3909, we get 975.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9750, and continue the process.

Let's proceed to step 9:
978 can be fit into 9750 9 times, resulting in a remainder of 948.
Write down 9 as next digit of the result. 
Result so far: 88743.9
Subtract 8802 from 9750 to get 948.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9480, and continue the process.

Let's proceed to step 10:
978 goes into 9480 9 times with a remainder of 678.
Record the quotient 9 as the next digit in the result. 
Result so far: 88743.99
If we take 8802 away from 9480, we end up with 678.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6780, and continue the process.

The final result is 88743.99 with a remainder of 0.678.