A:
Positive:
1 x 777121855 x 1554243717 x 457130519 x 409011585 x 91426195 x 818023323 x 2405951615 x 48119
Negative:
-1 x -77712185-5 x -15542437-17 x -4571305-19 x -4090115-85 x -914261-95 x -818023-323 x -240595-1615 x -48119
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 77,712,185, 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 | 77,712,185 | |
| -1 | -77,712,185 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 77,712,185.
Example:
1 x 77,712,185 = 77,712,185
and
-1 x -77,712,185 = 77,712,185
Notice both answers equal 77,712,185
With that explanation out of the way, let's continue. Next, we take the number 77,712,185 and divide it by 2:
77,712,185 ÷ 2 = 38,856,092.5
If the quotient is a whole number, then 2 and 38,856,092.5 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 | 77,712,185 | |
| -1 | -77,712,185 |
Now, we try dividing 77,712,185 by 3:
77,712,185 ÷ 3 = 25,904,061.6667
If the quotient is a whole number, then 3 and 25,904,061.6667 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 | 77,712,185 | |
| -1 | -77,712,185 |
Let's try dividing by 4:
77,712,185 ÷ 4 = 19,428,046.25
If the quotient is a whole number, then 4 and 19,428,046.25 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 | 77,712,185 | |
| -1 | 77,712,185 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 19 | 85 | 95 | 323 | 1,615 | 48,119 | 240,595 | 818,023 | 914,261 | 4,090,115 | 4,571,305 | 15,542,437 | 77,712,185 |
| -1 | -5 | -17 | -19 | -85 | -95 | -323 | -1,615 | -48,119 | -240,595 | -818,023 | -914,261 | -4,090,115 | -4,571,305 | -15,542,437 | -77,712,185 |
Here are some more numbers to try:
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