564400644 has 12 divisors (see below), whose sum is σ = 1316934864. Its totient is φ = 188133544.

The previous prime is 564400631. The next prime is 564400649. The reversal of 564400644 is 446004465.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×564400644² = 637096173895229472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (564400649) 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, 23516682 + ... + 23516705.

It is an arithmetic number, because the mean of its divisors is an integer number (109744572).

Almost surely, 2^564400644 is an apocalyptic number.

It is an amenable number.

564400644 is an abundant number, since it is smaller than the sum of its proper divisors (752534220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

564400644 is a wasteful number, since it uses less digits than its factorization.

564400644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47033394 (or 47033392 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

The square root of 564400644 is about 23757.1177544752. The cubic root of 564400644 is about 826.4105134067.

The spelling of 564400644 in words is "five hundred sixty-four million, four hundred thousand, six hundred forty-four".