A:
Positive:
1 x 858728655 x 1717457313 x 660560517 x 505134565 x 132112185 x 1010269221 x 3885651105 x 77713
Negative:
-1 x -85872865-5 x -17174573-13 x -6605605-17 x -5051345-65 x -1321121-85 x -1010269-221 x -388565-1105 x -77713
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 85,872,865, 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 | 85,872,865 | |
| -1 | -85,872,865 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 85,872,865.
Example:
1 x 85,872,865 = 85,872,865
and
-1 x -85,872,865 = 85,872,865
Notice both answers equal 85,872,865
With that explanation out of the way, let's continue. Next, we take the number 85,872,865 and divide it by 2:
85,872,865 ÷ 2 = 42,936,432.5
If the quotient is a whole number, then 2 and 42,936,432.5 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 | 85,872,865 | |
| -1 | -85,872,865 |
Now, we try dividing 85,872,865 by 3:
85,872,865 ÷ 3 = 28,624,288.3333
If the quotient is a whole number, then 3 and 28,624,288.3333 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 | 85,872,865 | |
| -1 | -85,872,865 |
Let's try dividing by 4:
85,872,865 ÷ 4 = 21,468,216.25
If the quotient is a whole number, then 4 and 21,468,216.25 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 | 85,872,865 | |
| -1 | 85,872,865 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 17 | 65 | 85 | 221 | 1,105 | 77,713 | 388,565 | 1,010,269 | 1,321,121 | 5,051,345 | 6,605,605 | 17,174,573 | 85,872,865 |
| -1 | -5 | -13 | -17 | -65 | -85 | -221 | -1,105 | -77,713 | -388,565 | -1,010,269 | -1,321,121 | -5,051,345 | -6,605,605 | -17,174,573 | -85,872,865 |
Here are some more numbers to try:
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