A:
Positive:
1 x 2156526197 x 3080751713 x 1658866391 x 2369809169 x 1276051421 x 512239433 x 4980431183 x 1822932947 x 731773031 x 711495473 x 394035629 x 38311
Negative:
-1 x -215652619-7 x -30807517-13 x -16588663-91 x -2369809-169 x -1276051-421 x -512239-433 x -498043-1183 x -182293-2947 x -73177-3031 x -71149-5473 x -39403-5629 x -38311
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 215,652,619, 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 | 215,652,619 | |
| -1 | -215,652,619 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 215,652,619.
Example:
1 x 215,652,619 = 215,652,619
and
-1 x -215,652,619 = 215,652,619
Notice both answers equal 215,652,619
With that explanation out of the way, let's continue. Next, we take the number 215,652,619 and divide it by 2:
215,652,619 ÷ 2 = 107,826,309.5
If the quotient is a whole number, then 2 and 107,826,309.5 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 | 215,652,619 | |
| -1 | -215,652,619 |
Now, we try dividing 215,652,619 by 3:
215,652,619 ÷ 3 = 71,884,206.3333
If the quotient is a whole number, then 3 and 71,884,206.3333 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 | 215,652,619 | |
| -1 | -215,652,619 |
Let's try dividing by 4:
215,652,619 ÷ 4 = 53,913,154.75
If the quotient is a whole number, then 4 and 53,913,154.75 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 | 215,652,619 | |
| -1 | 215,652,619 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 169 | 421 | 433 | 1,183 | 2,947 | 3,031 | 5,473 | 5,629 | 38,311 | 39,403 | 71,149 | 73,177 | 182,293 | 498,043 | 512,239 | 1,276,051 | 2,369,809 | 16,588,663 | 30,807,517 | 215,652,619 |
| -1 | -7 | -13 | -91 | -169 | -421 | -433 | -1,183 | -2,947 | -3,031 | -5,473 | -5,629 | -38,311 | -39,403 | -71,149 | -73,177 | -182,293 | -498,043 | -512,239 | -1,276,051 | -2,369,809 | -16,588,663 | -30,807,517 | -215,652,619 |
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