A:
Positive:
1 x 1618707797 x 2312439729 x 5581751199 x 813421203 x 7973931393 x 1162034007 x 403975771 x 28049
Negative:
-1 x -161870779-7 x -23124397-29 x -5581751-199 x -813421-203 x -797393-1393 x -116203-4007 x -40397-5771 x -28049
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 161,870,779, 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 | 161,870,779 | |
| -1 | -161,870,779 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 161,870,779.
Example:
1 x 161,870,779 = 161,870,779
and
-1 x -161,870,779 = 161,870,779
Notice both answers equal 161,870,779
With that explanation out of the way, let's continue. Next, we take the number 161,870,779 and divide it by 2:
161,870,779 ÷ 2 = 80,935,389.5
If the quotient is a whole number, then 2 and 80,935,389.5 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 | 161,870,779 | |
| -1 | -161,870,779 |
Now, we try dividing 161,870,779 by 3:
161,870,779 ÷ 3 = 53,956,926.3333
If the quotient is a whole number, then 3 and 53,956,926.3333 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 | 161,870,779 | |
| -1 | -161,870,779 |
Let's try dividing by 4:
161,870,779 ÷ 4 = 40,467,694.75
If the quotient is a whole number, then 4 and 40,467,694.75 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 | 161,870,779 | |
| -1 | 161,870,779 |
If you did it right, you will end up with this table:
| 1 | 7 | 29 | 199 | 203 | 1,393 | 4,007 | 5,771 | 28,049 | 40,397 | 116,203 | 797,393 | 813,421 | 5,581,751 | 23,124,397 | 161,870,779 |
| -1 | -7 | -29 | -199 | -203 | -1,393 | -4,007 | -5,771 | -28,049 | -40,397 | -116,203 | -797,393 | -813,421 | -5,581,751 | -23,124,397 | -161,870,779 |
Here are some more numbers to try:
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