A:
Positive:
1 x 2385216655 x 4770433329 x 822488583 x 2873755145 x 1644977415 x 5747512407 x 9909512035 x 19819
Negative:
-1 x -238521665-5 x -47704333-29 x -8224885-83 x -2873755-145 x -1644977-415 x -574751-2407 x -99095-12035 x -19819
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 238,521,665, 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 | 238,521,665 | |
| -1 | -238,521,665 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 238,521,665.
Example:
1 x 238,521,665 = 238,521,665
and
-1 x -238,521,665 = 238,521,665
Notice both answers equal 238,521,665
With that explanation out of the way, let's continue. Next, we take the number 238,521,665 and divide it by 2:
238,521,665 ÷ 2 = 119,260,832.5
If the quotient is a whole number, then 2 and 119,260,832.5 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 | 238,521,665 | |
| -1 | -238,521,665 |
Now, we try dividing 238,521,665 by 3:
238,521,665 ÷ 3 = 79,507,221.6667
If the quotient is a whole number, then 3 and 79,507,221.6667 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 | 238,521,665 | |
| -1 | -238,521,665 |
Let's try dividing by 4:
238,521,665 ÷ 4 = 59,630,416.25
If the quotient is a whole number, then 4 and 59,630,416.25 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 | 238,521,665 | |
| -1 | 238,521,665 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 83 | 145 | 415 | 2,407 | 12,035 | 19,819 | 99,095 | 574,751 | 1,644,977 | 2,873,755 | 8,224,885 | 47,704,333 | 238,521,665 |
| -1 | -5 | -29 | -83 | -145 | -415 | -2,407 | -12,035 | -19,819 | -99,095 | -574,751 | -1,644,977 | -2,873,755 | -8,224,885 | -47,704,333 | -238,521,665 |
Here are some more numbers to try:
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