28089804 has 24 divisors (see below), whose sum is σ = 65641968. Its totient is φ = 9349120.

The previous prime is 28089779. The next prime is 28089811. The reversal of 28089804 is 40898082.

It is a happy 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, 9244 + ... + 11900.

It is an arithmetic number, because the mean of its divisors is an integer number (2735082).

Almost surely, 2^28089804 is an apocalyptic number.

It is an amenable number.

28089804 is an abundant number, since it is smaller than the sum of its proper divisors (37552164).

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

28089804 is a wasteful number, since it uses less digits than its factorization.

28089804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545 (or 3543 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28089804 is about 5299.9815094017. The cubic root of 28089804 is about 303.9831910143.

The spelling of 28089804 in words is "twenty-eight million, eighty-nine thousand, eight hundred four".