664320244 has 36 divisors (see below), whose sum is σ = 1383834144. Its totient is φ = 278084016.

The previous prime is 664320211. The next prime is 664320263. The reversal of 664320244 is 442023466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30984 + ... + 47839.

Almost surely, 2^664320244 is an apocalyptic number.

It is an amenable number.

664320244 is an abundant number, since it is smaller than the sum of its proper divisors (719513900).

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

664320244 is a wasteful number, since it uses less digits than its factorization.

664320244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78884 (or 78875 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 664320244 is about 25774.4106431166. The cubic root of 664320244 is about 872.5543654600.

The spelling of 664320244 in words is "six hundred sixty-four million, three hundred twenty thousand, two hundred forty-four".