28564830 has 48 divisors (see below), whose sum is σ = 84880224. Its totient is φ = 6528960.

The previous prime is 28564819. The next prime is 28564871. The reversal of 28564830 is 3846582.

28564830 is a `hidden beast` number, since 2 + 8 + 5 + 648 + 3 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22041 + ... + 23300.

It is an arithmetic number, because the mean of its divisors is an integer number (1768338).

Almost surely, 2^28564830 is an apocalyptic number.

28564830 is an abundant number, since it is smaller than the sum of its proper divisors (56315394).

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

28564830 is a wasteful number, since it uses less digits than its factorization.

28564830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45361 (or 45358 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 28564830 is about 5344.6075627683. The cubic root of 28564830 is about 305.6871722915.

The spelling of 28564830 in words is "twenty-eight million, five hundred sixty-four thousand, eight hundred thirty".