28257404 has 12 divisors (see below), whose sum is σ = 56514864. Its totient is φ = 12110304.

The previous prime is 28257391. The next prime is 28257413. The reversal of 28257404 is 40475282.

28257404 is an admirable number.

It is a hoax number, since the sum of its digits (32) 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504569 + ... + 504624.

It is an arithmetic number, because the mean of its divisors is an integer number (4709572).

Almost surely, 2^28257404 is an apocalyptic number.

It is an amenable number.

28257404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28257404 is a wasteful number, since it uses less digits than its factorization.

28257404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009204 (or 1009202 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 28257404 is about 5315.7693704675. The cubic root of 28257404 is about 304.5865723431.

The spelling of 28257404 in words is "twenty-eight million, two hundred fifty-seven thousand, four hundred four".