28809272 has 16 divisors (see below), whose sum is σ = 54351240. Its totient is φ = 14315616.

The previous prime is 28809259. The next prime is 28809311. The reversal of 28809272 is 27290882.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9743 + ... + 12350.

Almost surely, 2^28809272 is an apocalyptic number.

It is an amenable number.

28809272 is a deficient number, since it is larger than the sum of its proper divisors (25541968).

28809272 is a wasteful number, since it uses less digits than its factorization.

28809272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22262 (or 22258 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28809272 is about 5367.4269440766. The cubic root of 28809272 is about 306.5566639699.

The spelling of 28809272 in words is "twenty-eight million, eight hundred nine thousand, two hundred seventy-two".