A:
Positive:
1 x 78857877 x 112654113 x 60659991 x 86657193 x 40859449 x 175631351 x 58372509 x 3143
Negative:
-1 x -7885787-7 x -1126541-13 x -606599-91 x -86657-193 x -40859-449 x -17563-1351 x -5837-2509 x -3143
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 7,885,787, 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 | 7,885,787 | |
| -1 | -7,885,787 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 7,885,787.
Example:
1 x 7,885,787 = 7,885,787
and
-1 x -7,885,787 = 7,885,787
Notice both answers equal 7,885,787
With that explanation out of the way, let's continue. Next, we take the number 7,885,787 and divide it by 2:
7,885,787 ÷ 2 = 3,942,893.5
If the quotient is a whole number, then 2 and 3,942,893.5 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 | 7,885,787 | |
| -1 | -7,885,787 |
Now, we try dividing 7,885,787 by 3:
7,885,787 ÷ 3 = 2,628,595.6667
If the quotient is a whole number, then 3 and 2,628,595.6667 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 | 7,885,787 | |
| -1 | -7,885,787 |
Let's try dividing by 4:
7,885,787 ÷ 4 = 1,971,446.75
If the quotient is a whole number, then 4 and 1,971,446.75 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 | 7,885,787 | |
| -1 | 7,885,787 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 193 | 449 | 1,351 | 2,509 | 3,143 | 5,837 | 17,563 | 40,859 | 86,657 | 606,599 | 1,126,541 | 7,885,787 |
| -1 | -7 | -13 | -91 | -193 | -449 | -1,351 | -2,509 | -3,143 | -5,837 | -17,563 | -40,859 | -86,657 | -606,599 | -1,126,541 | -7,885,787 |
Here are some more numbers to try:
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