28172908 has 12 divisors (see below), whose sum is σ = 49487760. Its totient is φ = 14033552.

The previous prime is 28172887. The next prime is 28172917. The reversal of 28172908 is 80927182.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12016 + ... + 14167.

It is an arithmetic number, because the mean of its divisors is an integer number (4123980).

Almost surely, 2^28172908 is an apocalyptic number.

It is an amenable number.

28172908 is a deficient number, since it is larger than the sum of its proper divisors (21314852).

28172908 is a wasteful number, since it uses less digits than its factorization.

28172908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26456 (or 26454 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28172908 is about 5307.8157466137. The cubic root of 28172908 is about 304.2826750918.

The spelling of 28172908 in words is "twenty-eight million, one hundred seventy-two thousand, nine hundred eight".