A:
Positive:
1 x 874061237 x 1248658967 x 1304569227 x 385049469 x 186367821 x 1064631589 x 550075747 x 15209
Negative:
-1 x -87406123-7 x -12486589-67 x -1304569-227 x -385049-469 x -186367-821 x -106463-1589 x -55007-5747 x -15209
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 87,406,123, 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 | 87,406,123 | |
| -1 | -87,406,123 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 87,406,123.
Example:
1 x 87,406,123 = 87,406,123
and
-1 x -87,406,123 = 87,406,123
Notice both answers equal 87,406,123
With that explanation out of the way, let's continue. Next, we take the number 87,406,123 and divide it by 2:
87,406,123 ÷ 2 = 43,703,061.5
If the quotient is a whole number, then 2 and 43,703,061.5 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 | 87,406,123 | |
| -1 | -87,406,123 |
Now, we try dividing 87,406,123 by 3:
87,406,123 ÷ 3 = 29,135,374.3333
If the quotient is a whole number, then 3 and 29,135,374.3333 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 | 87,406,123 | |
| -1 | -87,406,123 |
Let's try dividing by 4:
87,406,123 ÷ 4 = 21,851,530.75
If the quotient is a whole number, then 4 and 21,851,530.75 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 | 87,406,123 | |
| -1 | 87,406,123 |
If you did it right, you will end up with this table:
| 1 | 7 | 67 | 227 | 469 | 821 | 1,589 | 5,747 | 15,209 | 55,007 | 106,463 | 186,367 | 385,049 | 1,304,569 | 12,486,589 | 87,406,123 |
| -1 | -7 | -67 | -227 | -469 | -821 | -1,589 | -5,747 | -15,209 | -55,007 | -106,463 | -186,367 | -385,049 | -1,304,569 | -12,486,589 | -87,406,123 |
Here are some more numbers to try:
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