A:
Positive:
1 x 6401107155 x 128022143191 x 3351365739 x 866185907 x 705745955 x 6702733695 x 1732374535 x 141149
Negative:
-1 x -640110715-5 x -128022143-191 x -3351365-739 x -866185-907 x -705745-955 x -670273-3695 x -173237-4535 x -141149
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 640,110,715, 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 | 640,110,715 | |
| -1 | -640,110,715 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 640,110,715.
Example:
1 x 640,110,715 = 640,110,715
and
-1 x -640,110,715 = 640,110,715
Notice both answers equal 640,110,715
With that explanation out of the way, let's continue. Next, we take the number 640,110,715 and divide it by 2:
640,110,715 ÷ 2 = 320,055,357.5
If the quotient is a whole number, then 2 and 320,055,357.5 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 | 640,110,715 | |
| -1 | -640,110,715 |
Now, we try dividing 640,110,715 by 3:
640,110,715 ÷ 3 = 213,370,238.3333
If the quotient is a whole number, then 3 and 213,370,238.3333 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 | 640,110,715 | |
| -1 | -640,110,715 |
Let's try dividing by 4:
640,110,715 ÷ 4 = 160,027,678.75
If the quotient is a whole number, then 4 and 160,027,678.75 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 | 640,110,715 | |
| -1 | 640,110,715 |
If you did it right, you will end up with this table:
| 1 | 5 | 191 | 739 | 907 | 955 | 3,695 | 4,535 | 141,149 | 173,237 | 670,273 | 705,745 | 866,185 | 3,351,365 | 128,022,143 | 640,110,715 |
| -1 | -5 | -191 | -739 | -907 | -955 | -3,695 | -4,535 | -141,149 | -173,237 | -670,273 | -705,745 | -866,185 | -3,351,365 | -128,022,143 | -640,110,715 |
Here are some more numbers to try:
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