192
1024
6. Factors are 1, 2, 3, and 6.
the answer would seem to be ten.
Logically, the smallest number with 4 different prime factors would have to be the product of the smallest four prime numbers. So the smallest natural number with four different prime factors is 210 (2*3*5*7).
It is in fact 72
It is 2^6 = 64.
3
The smallest number that has exactly eight factors is 24. The factors of 1,2,3,4,6,8,12, and 24
192
6
192
6
4096
12
I think that it is 4
1024