A:
Positive:
1 x 1724075055 x 34481501101 x 1707005197 x 875165505 x 341401985 x 1750331733 x 994858665 x 19897
Negative:
-1 x -172407505-5 x -34481501-101 x -1707005-197 x -875165-505 x -341401-985 x -175033-1733 x -99485-8665 x -19897
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 172,407,505, 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 | 172,407,505 | |
| -1 | -172,407,505 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 172,407,505.
Example:
1 x 172,407,505 = 172,407,505
and
-1 x -172,407,505 = 172,407,505
Notice both answers equal 172,407,505
With that explanation out of the way, let's continue. Next, we take the number 172,407,505 and divide it by 2:
172,407,505 ÷ 2 = 86,203,752.5
If the quotient is a whole number, then 2 and 86,203,752.5 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 | 172,407,505 | |
| -1 | -172,407,505 |
Now, we try dividing 172,407,505 by 3:
172,407,505 ÷ 3 = 57,469,168.3333
If the quotient is a whole number, then 3 and 57,469,168.3333 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 | 172,407,505 | |
| -1 | -172,407,505 |
Let's try dividing by 4:
172,407,505 ÷ 4 = 43,101,876.25
If the quotient is a whole number, then 4 and 43,101,876.25 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 | 172,407,505 | |
| -1 | 172,407,505 |
If you did it right, you will end up with this table:
| 1 | 5 | 101 | 197 | 505 | 985 | 1,733 | 8,665 | 19,897 | 99,485 | 175,033 | 341,401 | 875,165 | 1,707,005 | 34,481,501 | 172,407,505 |
| -1 | -5 | -101 | -197 | -505 | -985 | -1,733 | -8,665 | -19,897 | -99,485 | -175,033 | -341,401 | -875,165 | -1,707,005 | -34,481,501 | -172,407,505 |
Here are some more numbers to try:
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