28704668 has 24 divisors (see below), whose sum is σ = 53136720. Its totient is φ = 13530240.

The previous prime is 28704659. The next prime is 28704671. The reversal of 28704668 is 86640782.

It is a congruent number.

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, 16898 + ... + 18518.

It is an arithmetic number, because the mean of its divisors is an integer number (2214030).

Almost surely, 2^28704668 is an apocalyptic number.

It is an amenable number.

28704668 is a deficient number, since it is larger than the sum of its proper divisors (24432052).

28704668 is a wasteful number, since it uses less digits than its factorization.

28704668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 1875 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 28704668 is about 5357.6737489325. The cubic root of 28704668 is about 306.1851870062.

The spelling of 28704668 in words is "twenty-eight million, seven hundred four thousand, six hundred sixty-eight".