A:
Positive:
1 x 2163416455 x 4326832913 x 1664166565 x 332833389 x 2430805445 x 4861611157 x 1869855785 x 37397
Negative:
-1 x -216341645-5 x -43268329-13 x -16641665-65 x -3328333-89 x -2430805-445 x -486161-1157 x -186985-5785 x -37397
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 216,341,645, 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 | 216,341,645 | |
| -1 | -216,341,645 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 216,341,645.
Example:
1 x 216,341,645 = 216,341,645
and
-1 x -216,341,645 = 216,341,645
Notice both answers equal 216,341,645
With that explanation out of the way, let's continue. Next, we take the number 216,341,645 and divide it by 2:
216,341,645 ÷ 2 = 108,170,822.5
If the quotient is a whole number, then 2 and 108,170,822.5 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 | 216,341,645 | |
| -1 | -216,341,645 |
Now, we try dividing 216,341,645 by 3:
216,341,645 ÷ 3 = 72,113,881.6667
If the quotient is a whole number, then 3 and 72,113,881.6667 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 | 216,341,645 | |
| -1 | -216,341,645 |
Let's try dividing by 4:
216,341,645 ÷ 4 = 54,085,411.25
If the quotient is a whole number, then 4 and 54,085,411.25 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 | 216,341,645 | |
| -1 | 216,341,645 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 89 | 445 | 1,157 | 5,785 | 37,397 | 186,985 | 486,161 | 2,430,805 | 3,328,333 | 16,641,665 | 43,268,329 | 216,341,645 |
| -1 | -5 | -13 | -65 | -89 | -445 | -1,157 | -5,785 | -37,397 | -186,985 | -486,161 | -2,430,805 | -3,328,333 | -16,641,665 | -43,268,329 | -216,341,645 |
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