How many factors does the number 4 have?
1
4
3
Infinite
4=1×44=2×2 The factors of 4 are: 1, 2 and 4. Therefore, the number 4 has 3 factors.
How many even factors does the number 720 have in all?
If a 3 digit number 'abc' has 3 factors, how many factors does the 6-digit number 'abcabc' have?