28728872 has 32 divisors (see below), whose sum is σ = 56142720. Its totient is φ = 13769280.

The previous prime is 28728857. The next prime is 28728881. The reversal of 28728872 is 27882782.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 20333 + ... + 21699.

It is an arithmetic number, because the mean of its divisors is an integer number (1754460).

Almost surely, 2^28728872 is an apocalyptic number.

It is an amenable number.

28728872 is a deficient number, since it is larger than the sum of its proper divisors (27413848).

28728872 is a wasteful number, since it uses less digits than its factorization.

28728872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1477 counting only the distinct ones).

The product of its digits is 200704, while the sum is 44.

The square root of 28728872 is about 5359.9320891220. The cubic root of 28728872 is about 306.2712220751.

The spelling of 28728872 in words is "twenty-eight million, seven hundred twenty-eight thousand, eight hundred seventy-two".