A:
Positive:
1 x 64430637711 x 5857330713 x 49562029143 x 4505639547 x 11778916017 x 1070817111 x 906078237 x 78221
Negative:
-1 x -644306377-11 x -58573307-13 x -49562029-143 x -4505639-547 x -1177891-6017 x -107081-7111 x -90607-8237 x -78221
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 644,306,377, 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 | 644,306,377 | |
| -1 | -644,306,377 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 644,306,377.
Example:
1 x 644,306,377 = 644,306,377
and
-1 x -644,306,377 = 644,306,377
Notice both answers equal 644,306,377
With that explanation out of the way, let's continue. Next, we take the number 644,306,377 and divide it by 2:
644,306,377 ÷ 2 = 322,153,188.5
If the quotient is a whole number, then 2 and 322,153,188.5 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 | 644,306,377 | |
| -1 | -644,306,377 |
Now, we try dividing 644,306,377 by 3:
644,306,377 ÷ 3 = 214,768,792.3333
If the quotient is a whole number, then 3 and 214,768,792.3333 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 | 644,306,377 | |
| -1 | -644,306,377 |
Let's try dividing by 4:
644,306,377 ÷ 4 = 161,076,594.25
If the quotient is a whole number, then 4 and 161,076,594.25 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 | 644,306,377 | |
| -1 | 644,306,377 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 143 | 547 | 6,017 | 7,111 | 8,237 | 78,221 | 90,607 | 107,081 | 1,177,891 | 4,505,639 | 49,562,029 | 58,573,307 | 644,306,377 |
| -1 | -11 | -13 | -143 | -547 | -6,017 | -7,111 | -8,237 | -78,221 | -90,607 | -107,081 | -1,177,891 | -4,505,639 | -49,562,029 | -58,573,307 | -644,306,377 |
Here are some more numbers to try:
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