A:
Positive:
1 x 1285266855 x 257053377 x 1836095535 x 367219171 x 1810235355 x 362047497 x 2586052485 x 51721
Negative:
-1 x -128526685-5 x -25705337-7 x -18360955-35 x -3672191-71 x -1810235-355 x -362047-497 x -258605-2485 x -51721
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 128,526,685, 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 | 128,526,685 | |
| -1 | -128,526,685 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 128,526,685.
Example:
1 x 128,526,685 = 128,526,685
and
-1 x -128,526,685 = 128,526,685
Notice both answers equal 128,526,685
With that explanation out of the way, let's continue. Next, we take the number 128,526,685 and divide it by 2:
128,526,685 ÷ 2 = 64,263,342.5
If the quotient is a whole number, then 2 and 64,263,342.5 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 | 128,526,685 | |
| -1 | -128,526,685 |
Now, we try dividing 128,526,685 by 3:
128,526,685 ÷ 3 = 42,842,228.3333
If the quotient is a whole number, then 3 and 42,842,228.3333 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 | 128,526,685 | |
| -1 | -128,526,685 |
Let's try dividing by 4:
128,526,685 ÷ 4 = 32,131,671.25
If the quotient is a whole number, then 4 and 32,131,671.25 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 | 128,526,685 | |
| -1 | 128,526,685 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 71 | 355 | 497 | 2,485 | 51,721 | 258,605 | 362,047 | 1,810,235 | 3,672,191 | 18,360,955 | 25,705,337 | 128,526,685 |
| -1 | -5 | -7 | -35 | -71 | -355 | -497 | -2,485 | -51,721 | -258,605 | -362,047 | -1,810,235 | -3,672,191 | -18,360,955 | -25,705,337 | -128,526,685 |
Here are some more numbers to try:
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