28564859 has 4 divisors (see below), whose sum is σ = 28578000. Its totient is φ = 28551720.

The previous prime is 28564819. The next prime is 28564871. The reversal of 28564859 is 95846582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28564859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28564819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2447 + ... + 7944.

It is an arithmetic number, because the mean of its divisors is an integer number (7144500).

Almost surely, 2^28564859 is an apocalyptic number.

28564859 is a deficient number, since it is larger than the sum of its proper divisors (13141).

28564859 is a wasteful number, since it uses less digits than its factorization.

28564859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13140.

The product of its digits is 691200, while the sum is 47.

The square root of 28564859 is about 5344.6102757825. The cubic root of 28564859 is about 305.6872757395.

The spelling of 28564859 in words is "twenty-eight million, five hundred sixty-four thousand, eight hundred fifty-nine".