A:
Positive:
1 x 2176855855 x 4353711713 x 1674504565 x 3349009599 x 3634152995 x 726835591 x 389357787 x 27955
Negative:
-1 x -217685585-5 x -43537117-13 x -16745045-65 x -3349009-599 x -363415-2995 x -72683-5591 x -38935-7787 x -27955
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 217,685,585, 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 | 217,685,585 | |
| -1 | -217,685,585 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 217,685,585.
Example:
1 x 217,685,585 = 217,685,585
and
-1 x -217,685,585 = 217,685,585
Notice both answers equal 217,685,585
With that explanation out of the way, let's continue. Next, we take the number 217,685,585 and divide it by 2:
217,685,585 ÷ 2 = 108,842,792.5
If the quotient is a whole number, then 2 and 108,842,792.5 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 | 217,685,585 | |
| -1 | -217,685,585 |
Now, we try dividing 217,685,585 by 3:
217,685,585 ÷ 3 = 72,561,861.6667
If the quotient is a whole number, then 3 and 72,561,861.6667 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 | 217,685,585 | |
| -1 | -217,685,585 |
Let's try dividing by 4:
217,685,585 ÷ 4 = 54,421,396.25
If the quotient is a whole number, then 4 and 54,421,396.25 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 | 217,685,585 | |
| -1 | 217,685,585 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 599 | 2,995 | 5,591 | 7,787 | 27,955 | 38,935 | 72,683 | 363,415 | 3,349,009 | 16,745,045 | 43,537,117 | 217,685,585 |
| -1 | -5 | -13 | -65 | -599 | -2,995 | -5,591 | -7,787 | -27,955 | -38,935 | -72,683 | -363,415 | -3,349,009 | -16,745,045 | -43,537,117 | -217,685,585 |
Here are some more numbers to try:
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