splitting it up into it's prime numbers
because
2^3 is a cubic number
2^6 is also a cubic number
5^3 and 7^3 are both cubic numbers
so 2^6 * 5^3 * 7^3 is also cubic number
so, since 560 = 2^4 * 5 * 7, obviously, we need to multiply 2^2
* 5^2 * 7^2 at the very least to make it 2^6 * 5^3 * 7^3, so that
it becomes a cubic number.