664652256 has 24 divisors (see below), whose sum is σ = 1744712424. Its totient is φ = 221550720.

The previous prime is 664652251. The next prime is 664652299. The reversal of 664652256 is 652256466.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664652251) 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, 3461635 + ... + 3461826.

It is an arithmetic number, because the mean of its divisors is an integer number (72696351).

Almost surely, 2^664652256 is an apocalyptic number.

It is an amenable number.

664652256 is an abundant number, since it is smaller than the sum of its proper divisors (1080060168).

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

664652256 is a wasteful number, since it uses less digits than its factorization.

664652256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6923474 (or 6923466 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 664652256 is about 25780.8505678149. The cubic root of 664652256 is about 872.6997021278.

The spelling of 664652256 in words is "six hundred sixty-four million, six hundred fifty-two thousand, two hundred fifty-six".