6: 1, 2, 3, 6
60
4
The smallest positive integer is 3.
If you mean 2, 3 and 7 as factors then the smallest number is 42
Since 3 is prime, the factors are 1 and 3.
12 is the smallest number to have 6 factors, 1, 2, 3, 4, 6, and 12. There are countless numbers larger than 12 having 6 factors.
36
The smallest possible number to get from 3 and 4 as your factors is 12...
The smallest number that has 9 and 12 as factors is 36.
It is 840.
There are none but the smallest 3 digit number is 161