28680864 has 24 divisors (see below), whose sum is σ = 75287520. Its totient is φ = 9560256.

The previous prime is 28680829. The next prime is 28680881. The reversal of 28680864 is 46808682.

It is a tau number, because it is divible by the number of its divisors (24).

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, 149284 + ... + 149475.

It is an arithmetic number, because the mean of its divisors is an integer number (3136980).

Almost surely, 2^28680864 is an apocalyptic number.

28680864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28680864 is an abundant number, since it is smaller than the sum of its proper divisors (46606656).

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

28680864 is a wasteful number, since it uses less digits than its factorization.

28680864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298772 (or 298764 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 28680864 is about 5355.4518016690. The cubic root of 28680864 is about 306.1005265854.

The spelling of 28680864 in words is "twenty-eight million, six hundred eighty thousand, eight hundred sixty-four".