564379721 has 4 divisors (see below), whose sum is σ = 567216000. Its totient is φ = 561543444.

The previous prime is 564379703. The next prime is 564379729. The reversal of 564379721 is 127973465.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127973465 = 5 ⋅25594693.

It is a cyclic number.

It is not a de Polignac number, because 564379721 - 2¹⁰ = 564378697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (564379729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417841 + ... + 1418238.

It is an arithmetic number, because the mean of its divisors is an integer number (141804000).

Almost surely, 2^564379721 is an apocalyptic number.

It is an amenable number.

564379721 is a deficient number, since it is larger than the sum of its proper divisors (2836279).

564379721 is a wasteful number, since it uses less digits than its factorization.

564379721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2836278.

The product of its digits is 317520, while the sum is 44.

The square root of 564379721 is about 23756.6773981548. The cubic root of 564379721 is about 826.4003012751.

The spelling of 564379721 in words is "five hundred sixty-four million, three hundred seventy-nine thousand, seven hundred twenty-one".