28404868 has 12 divisors (see below), whose sum is σ = 49872592. Its totient is φ = 14155560.

The previous prime is 28404853. The next prime is 28404881. The reversal of 28404868 is 86840482.

It is a self number, because there is not a number n which added to its sum of digits gives 28404868.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10338 + ... + 12793.

Almost surely, 2^28404868 is an apocalyptic number.

It is an amenable number.

28404868 is a deficient number, since it is larger than the sum of its proper divisors (21467724).

28404868 is a wasteful number, since it uses less digits than its factorization.

28404868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23442 (or 23440 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 28404868 is about 5329.6217501808. The cubic root of 28404868 is about 305.1154915128.

The spelling of 28404868 in words is "twenty-eight million, four hundred four thousand, eight hundred sixty-eight".