28278872 has 16 divisors (see below), whose sum is σ = 53085240. Its totient is φ = 14122816.

The previous prime is 28278791. The next prime is 28278881. The reversal of 28278872 is 27887282.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8063 + ... + 11025.

Almost surely, 2^28278872 is an apocalyptic number.

It is an amenable number.

28278872 is a deficient number, since it is larger than the sum of its proper divisors (24806368).

28278872 is a wasteful number, since it uses less digits than its factorization.

28278872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162 (or 4158 counting only the distinct ones).

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

The square root of 28278872 is about 5317.7882620503. The cubic root of 28278872 is about 304.6636873452.

The spelling of 28278872 in words is "twenty-eight million, two hundred seventy-eight thousand, eight hundred seventy-two".