28782784 has 28 divisors (see below), whose sum is σ = 57479184. Its totient is φ = 14299904.

The previous prime is 28782773. The next prime is 28782791. The reversal of 28782784 is 48728782.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

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, 9342 + ... + 12034.

It is an arithmetic number, because the mean of its divisors is an integer number (2052828).

Almost surely, 2^28782784 is an apocalyptic number.

It is an amenable number.

28782784 is a deficient number, since it is larger than the sum of its proper divisors (28696400).

28782784 is a wasteful number, since it uses less digits than its factorization.

28782784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872 (or 2862 counting only the distinct ones).

The product of its digits is 401408, while the sum is 46.

The square root of 28782784 is about 5364.9589001222. The cubic root of 28782784 is about 306.4626830831.

The spelling of 28782784 in words is "twenty-eight million, seven hundred eighty-two thousand, seven hundred eighty-four".