A:
Positive:
1 x 77204055 x 15440817 x 110291511 x 70185535 x 22058355 x 14037177 x 100265121 x 63805385 x 20053605 x 12761847 x 91151823 x 4235
Negative:
-1 x -7720405-5 x -1544081-7 x -1102915-11 x -701855-35 x -220583-55 x -140371-77 x -100265-121 x -63805-385 x -20053-605 x -12761-847 x -9115-1823 x -4235
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 7,720,405, 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 | 7,720,405 | |
| -1 | -7,720,405 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 7,720,405.
Example:
1 x 7,720,405 = 7,720,405
and
-1 x -7,720,405 = 7,720,405
Notice both answers equal 7,720,405
With that explanation out of the way, let's continue. Next, we take the number 7,720,405 and divide it by 2:
7,720,405 ÷ 2 = 3,860,202.5
If the quotient is a whole number, then 2 and 3,860,202.5 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 | 7,720,405 | |
| -1 | -7,720,405 |
Now, we try dividing 7,720,405 by 3:
7,720,405 ÷ 3 = 2,573,468.3333
If the quotient is a whole number, then 3 and 2,573,468.3333 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 | 7,720,405 | |
| -1 | -7,720,405 |
Let's try dividing by 4:
7,720,405 ÷ 4 = 1,930,101.25
If the quotient is a whole number, then 4 and 1,930,101.25 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 | 7,720,405 | |
| -1 | 7,720,405 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 11 | 35 | 55 | 77 | 121 | 385 | 605 | 847 | 1,823 | 4,235 | 9,115 | 12,761 | 20,053 | 63,805 | 100,265 | 140,371 | 220,583 | 701,855 | 1,102,915 | 1,544,081 | 7,720,405 |
| -1 | -5 | -7 | -11 | -35 | -55 | -77 | -121 | -385 | -605 | -847 | -1,823 | -4,235 | -9,115 | -12,761 | -20,053 | -63,805 | -100,265 | -140,371 | -220,583 | -701,855 | -1,102,915 | -1,544,081 | -7,720,405 |
Here are some more numbers to try:
Try the factor calculator