A:
Positive:
1 x 6443750155 x 12887500323 x 2801630573 x 8827055115 x 5603261365 x 17654111679 x 3837858395 x 76757
Negative:
-1 x -644375015-5 x -128875003-23 x -28016305-73 x -8827055-115 x -5603261-365 x -1765411-1679 x -383785-8395 x -76757
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 644,375,015, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 644,375,015 | |
| -1 | -644,375,015 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 644,375,015.
Example:
1 x 644,375,015 = 644,375,015
and
-1 x -644,375,015 = 644,375,015
Notice both answers equal 644,375,015
With that explanation out of the way, let's continue. Next, we take the number 644,375,015 and divide it by 2:
644,375,015 ÷ 2 = 322,187,507.5
If the quotient is a whole number, then 2 and 322,187,507.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 644,375,015 | |
| -1 | -644,375,015 |
Now, we try dividing 644,375,015 by 3:
644,375,015 ÷ 3 = 214,791,671.6667
If the quotient is a whole number, then 3 and 214,791,671.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 644,375,015 | |
| -1 | -644,375,015 |
Let's try dividing by 4:
644,375,015 ÷ 4 = 161,093,753.75
If the quotient is a whole number, then 4 and 161,093,753.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 644,375,015 | |
| -1 | 644,375,015 |
If you did it right, you will end up with this table:
| 1 | 5 | 23 | 73 | 115 | 365 | 1,679 | 8,395 | 76,757 | 383,785 | 1,765,411 | 5,603,261 | 8,827,055 | 28,016,305 | 128,875,003 | 644,375,015 |
| -1 | -5 | -23 | -73 | -115 | -365 | -1,679 | -8,395 | -76,757 | -383,785 | -1,765,411 | -5,603,261 | -8,827,055 | -28,016,305 | -128,875,003 | -644,375,015 |
Here are some more numbers to try:
Try the factor calculator