728
13 x 56
13 x (7x8)
13 x (7 x (2x4))
13 x (7 x (2 x (2x2)))
Since 2, 7, and 13 are prime numbers, the factor tree is complete.
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Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
Here is a factor tree of eight: 8 / \ 4 2 / \ 2 2
2 times 364 = 728
364
You're asking for two numbers that are equal to 728, when we know perfectly well that the only number that's equal to 728 is 728 itself.