28665172 has 12 divisors (see below), whose sum is σ = 50201536. Its totient is φ = 14321880.

The previous prime is 28665163. The next prime is 28665187. The reversal of 28665172 is 27156682.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 9343 + ... + 12025.

Almost surely, 2^28665172 is an apocalyptic number.

It is an amenable number.

28665172 is a deficient number, since it is larger than the sum of its proper divisors (21536364).

28665172 is a wasteful number, since it uses less digits than its factorization.

28665172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5358 (or 5356 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 28665172 is about 5353.9865520937. The cubic root of 28665172 is about 306.0446913807.

The spelling of 28665172 in words is "twenty-eight million, six hundred sixty-five thousand, one hundred seventy-two".