28712404 has 12 divisors (see below), whose sum is σ = 57424864. Its totient is φ = 12305304.

The previous prime is 28712389. The next prime is 28712413. The reversal of 28712404 is 40421782.

28712404 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 1025443 = 28712404 / (2 + 8 + 7 + 1 + 2 + 4 + 0 + 4).

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, 512694 + ... + 512749.

Almost surely, 2^28712404 is an apocalyptic number.

It is an amenable number.

28712404 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.

28712404 is a wasteful number, since it uses less digits than its factorization.

28712404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025454 (or 1025452 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 28712404 is about 5358.3956554178. The cubic root of 28712404 is about 306.2126904986.

The spelling of 28712404 in words is "twenty-eight million, seven hundred twelve thousand, four hundred four".