28564511 has 4 divisors (see below), whose sum is σ = 28579800. Its totient is φ = 28549224.

The previous prime is 28564499. The next prime is 28564537. The reversal of 28564511 is 11546582.

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

It is a cyclic number.

It is not a de Polignac number, because 28564511 - 2⁶ = 28564447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28564541) 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, 4376 + ... + 8733.

It is an arithmetic number, because the mean of its divisors is an integer number (7144950).

Almost surely, 2^28564511 is an apocalyptic number.

28564511 is a deficient number, since it is larger than the sum of its proper divisors (15289).

28564511 is a wasteful number, since it uses less digits than its factorization.

28564511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15288.

The product of its digits is 9600, while the sum is 32.

The square root of 28564511 is about 5344.5777195210. The cubic root of 28564511 is about 305.6860343587.

The spelling of 28564511 in words is "twenty-eight million, five hundred sixty-four thousand, five hundred eleven".