28687404 has 12 divisors (see below), whose sum is σ = 66937304. Its totient is φ = 9562464.

The previous prime is 28687387. The next prime is 28687411. The reversal of 28687404 is 40478682.

It is a tau number, because it is divible by the number of its divisors (12).

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, 1195297 + ... + 1195320.

Almost surely, 2^28687404 is an apocalyptic number.

It is an amenable number.

28687404 is an abundant number, since it is smaller than the sum of its proper divisors (38249900).

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

28687404 is a wasteful number, since it uses less digits than its factorization.

28687404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390624 (or 2390622 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 28687404 is about 5356.0623596071. The cubic root of 28687404 is about 306.1237911716.

The spelling of 28687404 in words is "twenty-eight million, six hundred eighty-seven thousand, four hundred four".