A:
Positive:
1 x 64640564313 x 49723511109 x 5930327373 x 17329911223 x 5285411417 x 4561794849 x 13330715899 x 40657
Negative:
-1 x -646405643-13 x -49723511-109 x -5930327-373 x -1732991-1223 x -528541-1417 x -456179-4849 x -133307-15899 x -40657
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 646,405,643, 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 | 646,405,643 | |
| -1 | -646,405,643 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 646,405,643.
Example:
1 x 646,405,643 = 646,405,643
and
-1 x -646,405,643 = 646,405,643
Notice both answers equal 646,405,643
With that explanation out of the way, let's continue. Next, we take the number 646,405,643 and divide it by 2:
646,405,643 ÷ 2 = 323,202,821.5
If the quotient is a whole number, then 2 and 323,202,821.5 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 | 646,405,643 | |
| -1 | -646,405,643 |
Now, we try dividing 646,405,643 by 3:
646,405,643 ÷ 3 = 215,468,547.6667
If the quotient is a whole number, then 3 and 215,468,547.6667 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 | 646,405,643 | |
| -1 | -646,405,643 |
Let's try dividing by 4:
646,405,643 ÷ 4 = 161,601,410.75
If the quotient is a whole number, then 4 and 161,601,410.75 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 | 646,405,643 | |
| -1 | 646,405,643 |
If you did it right, you will end up with this table:
| 1 | 13 | 109 | 373 | 1,223 | 1,417 | 4,849 | 15,899 | 40,657 | 133,307 | 456,179 | 528,541 | 1,732,991 | 5,930,327 | 49,723,511 | 646,405,643 |
| -1 | -13 | -109 | -373 | -1,223 | -1,417 | -4,849 | -15,899 | -40,657 | -133,307 | -456,179 | -528,541 | -1,732,991 | -5,930,327 | -49,723,511 | -646,405,643 |
Here are some more numbers to try:
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