How many composite numbers? How many prime numbers? How many even numbers? How many odd numbers?

How many composite numbers? How many prime numbers? How many even numbers? How many odd numbers?

72 = 2 ^ 3 × 3 ^ 2, so 72 has (3 + 1) * (2 + 1) = 12 factors including 1 and itself. Among these factors, there are 2 prime numbers, that is 2 and 3, so the total number is 12 - 2 - 1 = 9 (total number minus prime number, minus factor 1): 4, 6, 8, 9, 12, 18, 24, 36, 72. Odd number is 1