28290664 has 16 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 14098032.

The previous prime is 28290659. The next prime is 28290671. The reversal of 28290664 is 46609282.

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, 3304 + ... + 8215.

It is an arithmetic number, because the mean of its divisors is an integer number (3326400).

Almost surely, 2^28290664 is an apocalyptic number.

It is an amenable number.

28290664 is a deficient number, since it is larger than the sum of its proper divisors (24931736).

28290664 is a wasteful number, since it uses less digits than its factorization.

28290664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11832 (or 11828 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 28290664 is about 5318.8968781130. The cubic root of 28290664 is about 304.7060286729.

The spelling of 28290664 in words is "twenty-eight million, two hundred ninety thousand, six hundred sixty-four".