564639 has 8 divisors (see below), whose sum is σ = 760320. Its totient is φ = 372696.

The previous prime is 564617. The next prime is 564643. The reversal of 564639 is 936465.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 564639 - 2⁵ = 564607 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

564639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559 + ... + 1200.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2⁵⁶⁴⁶³⁹ is an apocalyptic number.

564639 is a deficient number, since it is larger than the sum of its proper divisors (195681).

564639 is a wasteful number, since it uses less digits than its factorization.

564639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869.

The product of its digits is 19440, while the sum is 33.

The square root of 564639 is about 751.4246469208. The cubic root of 564639 is about 82.6526832776.

The spelling of 564639 in words is "five hundred sixty-four thousand, six hundred thirty-nine".