28066784 has 24 divisors (see below), whose sum is σ = 55400688. Its totient is φ = 13996800.

The previous prime is 28066747. The next prime is 28066793. The reversal of 28066784 is 48766082.

It is a congruent number.

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, 14684 + ... + 16484.

It is an arithmetic number, because the mean of its divisors is an integer number (2308362).

Almost surely, 2^28066784 is an apocalyptic number.

It is an amenable number.

28066784 is a deficient number, since it is larger than the sum of its proper divisors (27333904).

28066784 is a wasteful number, since it uses less digits than its factorization.

28066784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298 (or 2290 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 28066784 is about 5297.8093585934. The cubic root of 28066784 is about 303.9001287817.

The spelling of 28066784 in words is "twenty-eight million, sixty-six thousand, seven hundred eighty-four".