A:
Positive:
1 x 7802155 x 15604317 x 4589567 x 1164585 x 9179137 x 5695335 x 2329685 x 1139
Negative:
-1 x -780215-5 x -156043-17 x -45895-67 x -11645-85 x -9179-137 x -5695-335 x -2329-685 x -1139
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 780,215, 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 | 780,215 | |
| -1 | -780,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 780,215.
Example:
1 x 780,215 = 780,215
and
-1 x -780,215 = 780,215
Notice both answers equal 780,215
With that explanation out of the way, let's continue. Next, we take the number 780,215 and divide it by 2:
780,215 ÷ 2 = 390,107.5
If the quotient is a whole number, then 2 and 390,107.5 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 | 780,215 | |
| -1 | -780,215 |
Now, we try dividing 780,215 by 3:
780,215 ÷ 3 = 260,071.6667
If the quotient is a whole number, then 3 and 260,071.6667 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 | 780,215 | |
| -1 | -780,215 |
Let's try dividing by 4:
780,215 ÷ 4 = 195,053.75
If the quotient is a whole number, then 4 and 195,053.75 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 | 780,215 | |
| -1 | 780,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 67 | 85 | 137 | 335 | 685 | 1,139 | 2,329 | 5,695 | 9,179 | 11,645 | 45,895 | 156,043 | 780,215 |
| -1 | -5 | -17 | -67 | -85 | -137 | -335 | -685 | -1,139 | -2,329 | -5,695 | -9,179 | -11,645 | -45,895 | -156,043 | -780,215 |
Here are some more numbers to try:
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