729 = 3

The "interest rating" is apparently computed from a weighting of several features of the number.

15(prime)+10(cube)+7(square)+4(âˆ‘digits >14)+3(even)+2(odd)+(#factors).

Obviously this odd square/cube is not prime. The sum of the digits is 18, and it has 7 factors.

Interest Rating = 10+7+4+2+7 = 30.

^{6}= (3^{2})^{3}= (3^{3})^{2}_____The "interest rating" is apparently computed from a weighting of several features of the number.

15(prime)+10(cube)+7(square)+4(âˆ‘digits >14)+3(even)+2(odd)+(#factors).

Obviously this odd square/cube is not prime. The sum of the digits is 18, and it has 7 factors.

Interest Rating = 10+7+4+2+7 = 30.