86909973 divided by 72 
We're looking to find how many times 72 goes into 86909973.

Step 1:
8 divided by 72 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 72

Moving on to step 2:
72 can be fit into 86 1 times, resulting in a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 72 from 86 leaves us with 14.
Fetch the next digit (9) from the dividend, attach it to 14 and continue: 149 / 72

On to step 3:
72 can be fit into 149 2 times, resulting in a remainder of 5.
The next digit of our result is 2. 
Result so far: 12.0
Deduct 144 from 149 and we're left with 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 72

Moving on to step 4:
72 can be fit into 50 0 times, resulting in a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 120.0
Subtract 0 from 50 to get 50.
Append the next digit (9) from the dividend to 50 and continue with: 509 / 72

Going ahead to step 5:
509 divided by 72 is 7 with a remainder of 5.
Write down 7 as next digit of the result. 
Result so far: 1207.0
Subtracting 504 from 509 leaves us with 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 72

Step 6:
72 goes into 59 0 times with a remainder of 59.
Use 0 as the next digit of our solution. 
Result so far: 12070.0
Deduct 0 from 59 and we're left with 59.
Append the next digit (7) from the dividend to 59 and continue with: 597 / 72

Step 7:
597 divided by 72 is 8 with a remainder of 21.
Record the quotient 8 as the next digit in the result. 
Result so far: 120708.0
If we take 576 away from 597, we end up with 21.
Include the next digit (3) from the dividend after 21, then repeat: 213 / 72

Step 8:
When dividing 213 by 72, we get 2 with a remainder of 69.
Use 2 as the next digit of our solution. 
Result so far: 1207082.0
Subtracting 144 from 213 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 9:
72 can be fit into 690 9 times, resulting in a remainder of 42.
Put 9 as the next digit of the answer. 
Result so far: 1207082.9
The remainder is 42 after subtracting 648 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 10:
If we divide 420 by 72, we get 5 and a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 1207082.95
If we take 360 away from 420, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 11:
When dividing 600 by 72, we get 8 with a remainder of 24.
The number 8 becomes the next digit in our result. 
Result so far: 1207082.958
Deduct 576 from 600 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 12:
If we divide 240 by 72, we get 3 and a remainder of 24.
Put 3 as the next digit of the answer. 
Result so far: 1207082.9583
Subtracting 216 from 240 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 13:
If we divide 240 by 72, we get 3 and a remainder of 24.
The number 3 becomes the next digit in our result. 
Result so far: 1207082.95833
Deduct 216 from 240 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final outcome is 1207082.95833, with a leftover of 2.4e-05.