81889639 ÷ 36 
We want to figure out the number of times 81889639 can be divided by 36.

Advancing to step 1:
36 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 36

Going ahead to step 2:
If we divide 81 by 36, we get 2 and a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 72 from 81 to get 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 36

Moving on to step 3:
The number 36 fits into 98 2 times, leaving a remainder of 26.
The next digit of our result is 2. 
Result so far: 22.0
Subtract 72 from 98 to get 26.
Include the next digit (8) from the dividend after 26, then repeat: 268 / 36

Advancing to step 4:
When dividing 268 by 36, we get 7 with a remainder of 16.
The next digit of our result is 7. 
Result so far: 227.0
If we subtract 252 from 268, we get 16.
Append the next digit (9) from the dividend to 16 and continue with: 169 / 36

Advancing to step 5:
169 divided by 36 is 4 with a remainder of 25.
The number 4 becomes the next digit in our result. 
Result so far: 2274.0
Subtracting 144 from 169 leaves us with 25.
Append the next digit (6) from the dividend to 25 and continue with: 256 / 36

Let's proceed to step 6:
36 can be fit into 256 7 times, resulting in a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 22747.0
Subtracting 252 from 256 leaves us with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 36

Going ahead to step 7:
43 divided by 36 is 1 with a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 227471.0
If we subtract 36 from 43, we get 7.
Take the next digit (9) from the dividend and append it to 7, then repeat: 79 / 36

Step 8:
79 divided by 36 is 2 with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2274712.0
Deduct 72 from 79 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 9:
70 divided by 36 is 1 with a remainder of 34.
Record the quotient 1 as the next digit in the result. 
Result so far: 2274712.1
Subtract 36 from 70 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 10:
36 can be fit into 340 9 times, resulting in a remainder of 16.
The number 9 becomes the next digit in our result. 
Result so far: 2274712.19
Deduct 324 from 340 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 11:
36 can be fit into 160 4 times, resulting in a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 2274712.194
If we take 144 away from 160, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 12:
When dividing 160 by 36, we get 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 2274712.1944
If we take 144 away from 160, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 2274712.1944 and a remainder of 0.00016.