564978239 has 4 divisors (see below), whose sum is σ = 645689424. Its totient is φ = 484267056.

The previous prime is 564978229. The next prime is 564978269. The reversal of 564978239 is 932879465.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-564978239 is a prime.

It is a super-2 number, since 2×564978239² = 638400821087082242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564978229) 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, 40355582 + ... + 40355595.

It is an arithmetic number, because the mean of its divisors is an integer number (161422356).

Almost surely, 2^564978239 is an apocalyptic number.

564978239 is a deficient number, since it is larger than the sum of its proper divisors (80711185).

564978239 is an equidigital number, since it uses as much as digits as its factorization.

564978239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80711184.

The product of its digits is 3265920, while the sum is 53.

The square root of 564978239 is about 23769.2708975265. The cubic root of 564978239 is about 826.6923273086.

The spelling of 564978239 in words is "five hundred sixty-four million, nine hundred seventy-eight thousand, two hundred thirty-nine".