28564013 has 4 divisors (see below), whose sum is σ = 28583100. Its totient is φ = 28544928.

The previous prime is 28564009. The next prime is 28564031. The reversal of 28564013 is 31046582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15697444 + 12866569 = 3962^2 + 3587^2 .

It is a cyclic number.

It is not a de Polignac number, because 28564013 - 2² = 28564009 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 (28564073) 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, 7088 + ... + 10361.

It is an arithmetic number, because the mean of its divisors is an integer number (7145775).

Almost surely, 2^28564013 is an apocalyptic number.

It is an amenable number.

28564013 is a deficient number, since it is larger than the sum of its proper divisors (19087).

28564013 is a wasteful number, since it uses less digits than its factorization.

28564013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19086.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 28564013 is about 5344.5311300431. The cubic root of 28564013 is about 305.6842578824.

The spelling of 28564013 in words is "twenty-eight million, five hundred sixty-four thousand, thirteen".