A:
Positive:
1 x 777178155 x 155435637 x 1110254535 x 2220509263 x 2955051315 x 591011841 x 422158443 x 9205
Negative:
-1 x -77717815-5 x -15543563-7 x -11102545-35 x -2220509-263 x -295505-1315 x -59101-1841 x -42215-8443 x -9205
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 77,717,815, 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 | 77,717,815 | |
| -1 | -77,717,815 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 77,717,815.
Example:
1 x 77,717,815 = 77,717,815
and
-1 x -77,717,815 = 77,717,815
Notice both answers equal 77,717,815
With that explanation out of the way, let's continue. Next, we take the number 77,717,815 and divide it by 2:
77,717,815 ÷ 2 = 38,858,907.5
If the quotient is a whole number, then 2 and 38,858,907.5 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 | 77,717,815 | |
| -1 | -77,717,815 |
Now, we try dividing 77,717,815 by 3:
77,717,815 ÷ 3 = 25,905,938.3333
If the quotient is a whole number, then 3 and 25,905,938.3333 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 | 77,717,815 | |
| -1 | -77,717,815 |
Let's try dividing by 4:
77,717,815 ÷ 4 = 19,429,453.75
If the quotient is a whole number, then 4 and 19,429,453.75 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 | 77,717,815 | |
| -1 | 77,717,815 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 263 | 1,315 | 1,841 | 8,443 | 9,205 | 42,215 | 59,101 | 295,505 | 2,220,509 | 11,102,545 | 15,543,563 | 77,717,815 |
| -1 | -5 | -7 | -35 | -263 | -1,315 | -1,841 | -8,443 | -9,205 | -42,215 | -59,101 | -295,505 | -2,220,509 | -11,102,545 | -15,543,563 | -77,717,815 |
Here are some more numbers to try:
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