28684566 has 24 divisors (see below), whose sum is σ = 65421720. Its totient is φ = 9058176.

The previous prime is 28684553. The next prime is 28684603. The reversal of 28684566 is 66548682.

28684566 is a `hidden beast` number, since 2 + 8 + 6 + 84 + 566 = 666.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 41595 + ... + 42278.

It is an arithmetic number, because the mean of its divisors is an integer number (2725905).

Almost surely, 2^28684566 is an apocalyptic number.

28684566 is an abundant number, since it is smaller than the sum of its proper divisors (36737154).

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

28684566 is a wasteful number, since it uses less digits than its factorization.

28684566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83900 (or 83897 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 28684566 is about 5355.7974196192. The cubic root of 28684566 is about 306.1136960561.

The spelling of 28684566 in words is "twenty-eight million, six hundred eighty-four thousand, five hundred sixty-six".