28781984 has 48 divisors (see below), whose sum is σ = 70652736. Its totient is φ = 11212800.

The previous prime is 28781971. The next prime is 28782031. The reversal of 28781984 is 48918782.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3377 + ... + 8304.

It is an arithmetic number, because the mean of its divisors is an integer number (1471932).

Almost surely, 2^28781984 is an apocalyptic number.

It is an amenable number.

28781984 is an abundant number, since it is smaller than the sum of its proper divisors (41870752).

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

28781984 is a wasteful number, since it uses less digits than its factorization.

28781984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11709 (or 11701 counting only the distinct ones).

The product of its digits is 258048, while the sum is 47.

The square root of 28781984 is about 5364.8843417170. The cubic root of 28781984 is about 306.4598437421.

The spelling of 28781984 in words is "twenty-eight million, seven hundred eighty-one thousand, nine hundred eighty-four".