28865808 has 50 divisors (see below), whose sum is σ = 83549774. Its totient is φ = 9621504.

The previous prime is 28865803. The next prime is 28865821. The reversal of 28865808 is 80856882.

It can be written as a sum of positive squares in only one way, i.e., 15116544 + 13749264 = 3888^2 + 3708^2 .

It is not an unprimeable number, because it can be changed into a prime (28865801) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 9841 + ... + 12432.

Almost surely, 2^28865808 is an apocalyptic number.

It is an amenable number.

28865808 is an abundant number, since it is smaller than the sum of its proper divisors (54683966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28865808 is a wasteful number, since it uses less digits than its factorization.

28865808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22293 (or 22278 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The square root of 28865808 is about 5372.6909458855. The cubic root of 28865808 is about 306.7570642977.

The spelling of 28865808 in words is "twenty-eight million, eight hundred sixty-five thousand, eight hundred eight".