640584 divided by 39 
We want to figure out the number of times 640584 can be divided by 39.

Moving on to step 1:
The number 39 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 39

Let's proceed to step 2:
39 can be fit into 64 1 times, resulting in a remainder of 25.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 25 after subtracting 39 from 64.
Bring next digit (0) of the dividend behind the 25 and repeat the process: 250 / 39

Moving on to step 3:
39 can be fit into 250 6 times, resulting in a remainder of 16.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtract 234 from 250 to get 16.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 39

Advancing to step 4:
If we divide 165 by 39, we get 4 and a remainder of 9.
The number 4 becomes the next digit in our result. 
Result so far: 164.0
Subtracting 156 from 165 leaves us with 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 39

Step 5:
39 can be fit into 98 2 times, resulting in a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 1642.0
The remainder is 20 after subtracting 78 from 98.
Take the next digit (4) from the dividend and append it to 20, then repeat: 204 / 39

Step 6:
39 goes into 204 5 times with a remainder of 9.
The next digit of our result is 5. 
Result so far: 16425.0
The remainder is 9 after subtracting 195 from 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
If we divide 90 by 39, we get 2 and a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 16425.2
Subtract 78 from 90 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
39 goes into 120 3 times with a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 16425.23
The remainder is 3 after subtracting 117 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 9:
39 goes into 30 0 times with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 16425.23
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 10:
300 divided by 39 is 7 with a remainder of 27.
Use 7 as the next digit of our solution. 
Result so far: 16425.2307
If we take 273 away from 300, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 11:
270 divided by 39 is 6 with a remainder of 36.
The number 6 becomes the next digit in our result. 
Result so far: 16425.23076
Subtracting 234 from 270 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 12:
360 divided by 39 is 9 with a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 16425.230769
Subtracting 351 from 360 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 13:
If we divide 90 by 39, we get 2 and a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 16425.2307692
The remainder is 12 after subtracting 78 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 14:
120 divided by 39 is 3 with a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 16425.23076923
If we subtract 117 from 120, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final result is 16425.23076923 with a remainder of 3e-09.