28705868 has 24 divisors (see below), whose sum is σ = 51809184. Its totient is φ = 13910400.

The previous prime is 28705847. The next prime is 28705891. The reversal of 28705868 is 86850782.

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, 16496 + ... + 18152.

It is an arithmetic number, because the mean of its divisors is an integer number (2158716).

Almost surely, 2^28705868 is an apocalyptic number.

It is an amenable number.

28705868 is a deficient number, since it is larger than the sum of its proper divisors (23103316).

28705868 is a wasteful number, since it uses less digits than its factorization.

28705868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793 (or 1791 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 28705868 is about 5357.7857366640. The cubic root of 28705868 is about 306.1894536422.

The spelling of 28705868 in words is "twenty-eight million, seven hundred five thousand, eight hundred sixty-eight".