WE WILL LEARN HOW TO FIND THE NUMBER OF PRIME FACTORS IN A GIVEN NUMBER.
72=2^3*3^2.so total no of factors will be (3+1)(2+1)=12.
Total no of factors =1+ no of prime factors + no of composite factors.
So as we can see that 72 is resolved into prime factorization above..it has two prime factors 2,3.