Bad
It is: 8 times 8 = 64
There is no such number.
16 itself. 64/16is 4
It is: 8 times 8 = 64
No number multiplied by itself three times gives 56. The nearest ones are 3 cubed is 27 and 4 cubed is 64.
Two to the sixth power = 64
The number is sqrt(64) = 8
8
64
64
The greatest factor of a number is the number itself.