A:
Positive:
1 x 7872466555 x 15744933113 x 6055743565 x 12111487139 x 5663645695 x 11327291807 x 4356659035 x 87133
Negative:
-1 x -787246655-5 x -157449331-13 x -60557435-65 x -12111487-139 x -5663645-695 x -1132729-1807 x -435665-9035 x -87133
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 787,246,655, 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 | 787,246,655 | |
| -1 | -787,246,655 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 787,246,655.
Example:
1 x 787,246,655 = 787,246,655
and
-1 x -787,246,655 = 787,246,655
Notice both answers equal 787,246,655
With that explanation out of the way, let's continue. Next, we take the number 787,246,655 and divide it by 2:
787,246,655 ÷ 2 = 393,623,327.5
If the quotient is a whole number, then 2 and 393,623,327.5 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 | 787,246,655 | |
| -1 | -787,246,655 |
Now, we try dividing 787,246,655 by 3:
787,246,655 ÷ 3 = 262,415,551.6667
If the quotient is a whole number, then 3 and 262,415,551.6667 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 | 787,246,655 | |
| -1 | -787,246,655 |
Let's try dividing by 4:
787,246,655 ÷ 4 = 196,811,663.75
If the quotient is a whole number, then 4 and 196,811,663.75 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 | 787,246,655 | |
| -1 | 787,246,655 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 139 | 695 | 1,807 | 9,035 | 87,133 | 435,665 | 1,132,729 | 5,663,645 | 12,111,487 | 60,557,435 | 157,449,331 | 787,246,655 |
| -1 | -5 | -13 | -65 | -139 | -695 | -1,807 | -9,035 | -87,133 | -435,665 | -1,132,729 | -5,663,645 | -12,111,487 | -60,557,435 | -157,449,331 | -787,246,655 |
Here are some more numbers to try:
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