28724972 has 24 divisors (see below), whose sum is σ = 52534272. Its totient is φ = 13726800.

The previous prime is 28724963. The next prime is 28724981. The reversal of 28724972 is 27942782.

It is an interprime number because it is at equal distance from previous prime (28724963) and next prime (28724981).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8897 + ... + 11687.

It is an arithmetic number, because the mean of its divisors is an integer number (2188928).

Almost surely, 2^28724972 is an apocalyptic number.

It is an amenable number.

28724972 is a deficient number, since it is larger than the sum of its proper divisors (23809300).

28724972 is a wasteful number, since it uses less digits than its factorization.

28724972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909 (or 2907 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 28724972 is about 5359.5682661946. The cubic root of 28724972 is about 306.2573624774.

The spelling of 28724972 in words is "twenty-eight million, seven hundred twenty-four thousand, nine hundred seventy-two".