28806404 has 24 divisors (see below), whose sum is σ = 55774656. Its totient is φ = 12908000.

The previous prime is 28806397. The next prime is 28806439. The reversal of 28806404 is 40460882.

It is a super-2 number, since 2×28806404² = 1659617822822432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1487 + ... + 7734.

It is an arithmetic number, because the mean of its divisors is an integer number (2323944).

Almost surely, 2^28806404 is an apocalyptic number.

It is an amenable number.

28806404 is a deficient number, since it is larger than the sum of its proper divisors (26968252).

28806404 is a wasteful number, since it uses less digits than its factorization.

28806404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9307 (or 9305 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 28806404 is about 5367.1597703068. The cubic root of 28806404 is about 306.5464909292.

The spelling of 28806404 in words is "twenty-eight million, eight hundred six thousand, four hundred four".