664025244 has 12 divisors (see below), whose sum is σ = 1549392264. Its totient is φ = 221341744.

The previous prime is 664025227. The next prime is 664025251. The reversal of 664025244 is 442520466.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27667707 + ... + 27667730.

It is an arithmetic number, because the mean of its divisors is an integer number (129116022).

Almost surely, 2^664025244 is an apocalyptic number.

It is an amenable number.

664025244 is an abundant number, since it is smaller than the sum of its proper divisors (885367020).

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

664025244 is a wasteful number, since it uses less digits than its factorization.

664025244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55335444 (or 55335442 counting only the distinct ones).

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

The square root of 664025244 is about 25768.6872773915. The cubic root of 664025244 is about 872.4251899854.

The spelling of 664025244 in words is "six hundred sixty-four million, twenty-five thousand, two hundred forty-four".