28780304 has 20 divisors (see below), whose sum is σ = 63728064. Its totient is φ = 12334368.

The previous prime is 28780289. The next prime is 28780313. The reversal of 28780304 is 40308782.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128372 + ... + 128595.

Almost surely, 2^28780304 is an apocalyptic number.

It is an amenable number.

28780304 is an abundant number, since it is smaller than the sum of its proper divisors (34947760).

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

28780304 is a wasteful number, since it uses less digits than its factorization.

28780304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256982 (or 256976 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28780304 is about 5364.7277656932. The cubic root of 28780304 is about 306.4538809547.

The spelling of 28780304 in words is "twenty-eight million, seven hundred eighty thousand, three hundred four".