A:
Positive:
1 x 872120697 x 1245886771 x 1228339379 x 230111463 x 188363497 x 1754772653 x 328733241 x 26909
Negative:
-1 x -87212069-7 x -12458867-71 x -1228339-379 x -230111-463 x -188363-497 x -175477-2653 x -32873-3241 x -26909
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 87,212,069, 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 | 87,212,069 | |
| -1 | -87,212,069 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 87,212,069.
Example:
1 x 87,212,069 = 87,212,069
and
-1 x -87,212,069 = 87,212,069
Notice both answers equal 87,212,069
With that explanation out of the way, let's continue. Next, we take the number 87,212,069 and divide it by 2:
87,212,069 ÷ 2 = 43,606,034.5
If the quotient is a whole number, then 2 and 43,606,034.5 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 | 87,212,069 | |
| -1 | -87,212,069 |
Now, we try dividing 87,212,069 by 3:
87,212,069 ÷ 3 = 29,070,689.6667
If the quotient is a whole number, then 3 and 29,070,689.6667 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 | 87,212,069 | |
| -1 | -87,212,069 |
Let's try dividing by 4:
87,212,069 ÷ 4 = 21,803,017.25
If the quotient is a whole number, then 4 and 21,803,017.25 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 | 87,212,069 | |
| -1 | 87,212,069 |
If you did it right, you will end up with this table:
| 1 | 7 | 71 | 379 | 463 | 497 | 2,653 | 3,241 | 26,909 | 32,873 | 175,477 | 188,363 | 230,111 | 1,228,339 | 12,458,867 | 87,212,069 |
| -1 | -7 | -71 | -379 | -463 | -497 | -2,653 | -3,241 | -26,909 | -32,873 | -175,477 | -188,363 | -230,111 | -1,228,339 | -12,458,867 | -87,212,069 |
Here are some more numbers to try:
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