564819721 has 8 divisors (see below), whose sum is σ = 589593600. Its totient is φ = 540455520.

The previous prime is 564819709. The next prime is 564819733. The reversal of 564819721 is 127918465.

It is an interprime number because it is at equal distance from previous prime (564819709) and next prime (564819733).

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

It is a cyclic number.

It is not a de Polignac number, because 564819721 - 2¹⁵ = 564786953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (564819701) 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, 99601 + ... + 105118.

It is an arithmetic number, because the mean of its divisors is an integer number (73699200).

Almost surely, 2^564819721 is an apocalyptic number.

It is an amenable number.

564819721 is a deficient number, since it is larger than the sum of its proper divisors (24773879).

564819721 is a wasteful number, since it uses less digits than its factorization.

564819721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204839.

The product of its digits is 120960, while the sum is 43.

The square root of 564819721 is about 23765.9361481933. The cubic root of 564819721 is about 826.6150040519.

The spelling of 564819721 in words is "five hundred sixty-four million, eight hundred nineteen thousand, seven hundred twenty-one".