2564531644 has 12 divisors (see below), whose sum is σ = 4551141168. Its totient is φ = 1264205600.

The previous prime is 2564531621. The next prime is 2564531647. The reversal of 2564531644 is 4461354652.

It is a junction number, because it is equal to n+sod(n) for n = 2564531597 and 2564531606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564531647) 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, 4514737 + ... + 4515304.

It is an arithmetic number, because the mean of its divisors is an integer number (379261764).

Almost surely, 2^2564531644 is an apocalyptic number.

It is an amenable number.

2564531644 is a deficient number, since it is larger than the sum of its proper divisors (1986609524).

2564531644 is a wasteful number, since it uses less digits than its factorization.

2564531644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9030116 (or 9030114 counting only the distinct ones).

The product of its digits is 345600, while the sum is 40.

The square root of 2564531644 is about 50641.2050014610. The cubic root of 2564531644 is about 1368.7874692550.

The spelling of 2564531644 in words is "two billion, five hundred sixty-four million, five hundred thirty-one thousand, six hundred forty-four".