64280839 divided by 853 
We want to figure out the number of times 64280839 can be divided by 853.

Advancing to step 1:
When dividing 6 by 853, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 853

Let's proceed to step 2:
853 can be fit into 64 0 times, resulting in a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Append the next digit (2) from the dividend to 64 and continue with: 642 / 853

Moving on to step 3:
If we divide 642 by 853, we get 0 and a remainder of 642.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 642 and we're left with 642.
Grab the next digit (8) from the dividend, add it to 642, then carry on: 6428 / 853

Advancing to step 4:
853 goes into 6428 7 times with a remainder of 457.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 5971 from 6428 leaves us with 457.
Append the next digit (0) from the dividend to 457 and continue with: 4570 / 853

On to step 5:
When dividing 4570 by 853, we get 5 with a remainder of 305.
Record the quotient 5 as the next digit in the result. 
Result so far: 75.0
Subtracting 4265 from 4570 leaves us with 305.
Bring next digit (8) of the dividend behind the 305 and repeat the process: 3058 / 853

Moving on to step 6:
3058 divided by 853 is 3 with a remainder of 499.
Use 3 as the next digit of our solution. 
Result so far: 753.0
Subtracting 2559 from 3058 leaves us with 499.
Append the next digit (3) from the dividend to 499 and continue with: 4993 / 853

On to step 7:
If we divide 4993 by 853, we get 5 and a remainder of 728.
Record the quotient 5 as the next digit in the result. 
Result so far: 7535.0
Deduct 4265 from 4993 and we're left with 728.
Append the next digit (9) from the dividend to 728 and continue with: 7289 / 853

Going ahead to step 8:
If we divide 7289 by 853, we get 8 and a remainder of 465.
The next digit of our result is 8. 
Result so far: 75358.0
If we subtract 6824 from 7289, we get 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

On to step 9:
4650 divided by 853 is 5 with a remainder of 385.
The next digit of our result is 5. 
Result so far: 75358.5
If we take 4265 away from 4650, we end up with 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Advancing to step 10:
When dividing 3850 by 853, we get 4 with a remainder of 438.
Write down 4 as next digit of the result. 
Result so far: 75358.54
If we take 3412 away from 3850, we end up with 438.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4380, and continue the process.

Advancing to step 11:
When dividing 4380 by 853, we get 5 with a remainder of 115.
Put 5 as the next digit of the answer. 
Result so far: 75358.545
If we subtract 4265 from 4380, we get 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Advancing to step 12:
When dividing 1150 by 853, we get 1 with a remainder of 297.
Put 1 as the next digit of the answer. 
Result so far: 75358.5451
Subtracting 853 from 1150 leaves us with 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Advancing to step 13:
2970 divided by 853 is 3 with a remainder of 411.
The next digit of our result is 3. 
Result so far: 75358.54513
If we subtract 2559 from 2970, we get 411.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4110, and continue the process.

Let's proceed to step 14:
The number 853 fits into 4110 4 times, leaving a remainder of 698.
Record the quotient 4 as the next digit in the result. 
Result so far: 75358.545134
Deduct 3412 from 4110 and we're left with 698.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6980, and continue the process.

Step 15:
853 goes into 6980 8 times with a remainder of 156.
Record the quotient 8 as the next digit in the result. 
Result so far: 75358.5451348
Subtract 6824 from 6980 to get 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Let's proceed to step 16:
853 can be fit into 1560 1 times, resulting in a remainder of 707.
Record the quotient 1 as the next digit in the result. 
Result so far: 75358.54513481
If we take 853 away from 1560, we end up with 707.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7070, and continue the process.

The final outcome is 75358.54513481, with a leftover of 7.07e-07.