28564911 has 12 divisors (see below), whose sum is σ = 41563392. Its totient is φ = 18903456.

The previous prime is 28564891. The next prime is 28564951. The reversal of 28564911 is 11946582.

28564911 is a `hidden beast` number, since 2 + 8 + 5 + 649 + 1 + 1 = 666.

It is not a de Polignac number, because 28564911 - 2¹⁸ = 28302767 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28564951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10351 + ... + 12816.

It is an arithmetic number, because the mean of its divisors is an integer number (3463616).

Almost surely, 2^28564911 is an apocalyptic number.

28564911 is a deficient number, since it is larger than the sum of its proper divisors (12998481).

28564911 is a wasteful number, since it uses less digits than its factorization.

28564911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23310 (or 23307 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 28564911 is about 5344.6151404942. The cubic root of 28564911 is about 305.6874612323.

The spelling of 28564911 in words is "twenty-eight million, five hundred sixty-four thousand, nine hundred eleven".