A:
Positive:
1 x 7826022113 x 602001719 x 411895967 x 1168063247 x 316843871 x 898511273 x 614774729 x 16549
Negative:
-1 x -78260221-13 x -6020017-19 x -4118959-67 x -1168063-247 x -316843-871 x -89851-1273 x -61477-4729 x -16549
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 78,260,221, 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 | 78,260,221 | |
| -1 | -78,260,221 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 78,260,221.
Example:
1 x 78,260,221 = 78,260,221
and
-1 x -78,260,221 = 78,260,221
Notice both answers equal 78,260,221
With that explanation out of the way, let's continue. Next, we take the number 78,260,221 and divide it by 2:
78,260,221 ÷ 2 = 39,130,110.5
If the quotient is a whole number, then 2 and 39,130,110.5 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 | 78,260,221 | |
| -1 | -78,260,221 |
Now, we try dividing 78,260,221 by 3:
78,260,221 ÷ 3 = 26,086,740.3333
If the quotient is a whole number, then 3 and 26,086,740.3333 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 | 78,260,221 | |
| -1 | -78,260,221 |
Let's try dividing by 4:
78,260,221 ÷ 4 = 19,565,055.25
If the quotient is a whole number, then 4 and 19,565,055.25 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 | 78,260,221 | |
| -1 | 78,260,221 |
If you did it right, you will end up with this table:
| 1 | 13 | 19 | 67 | 247 | 871 | 1,273 | 4,729 | 16,549 | 61,477 | 89,851 | 316,843 | 1,168,063 | 4,118,959 | 6,020,017 | 78,260,221 |
| -1 | -13 | -19 | -67 | -247 | -871 | -1,273 | -4,729 | -16,549 | -61,477 | -89,851 | -316,843 | -1,168,063 | -4,118,959 | -6,020,017 | -78,260,221 |
Here are some more numbers to try:
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