664944264 has 48 divisors (see below), whose sum is σ = 1823702400. Its totient is φ = 218840544.

The previous prime is 664944257. The next prime is 664944271. The reversal of 664944264 is 462449466.

664944264 is a `hidden beast` number, since 66 + 494 + 42 + 64 = 666.

It is an interprime number because it is at equal distance from previous prime (664944257) and next prime (664944271).

It is a nude number because it is divisible by every one of its digits.

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, 52764 + ... + 64139.

It is an arithmetic number, because the mean of its divisors is an integer number (37993800).

Almost surely, 2^664944264 is an apocalyptic number.

It is an amenable number.

664944264 is an abundant number, since it is smaller than the sum of its proper divisors (1158758136).

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

664944264 is a wasteful number, since it uses less digits than its factorization.

664944264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116994 (or 116987 counting only the distinct ones).

The product of its digits is 995328, while the sum is 45.

The square root of 664944264 is about 25786.5132191229. The cubic root of 664944264 is about 872.8274872373.

The spelling of 664944264 in words is "six hundred sixty-four million, nine hundred forty-four thousand, two hundred sixty-four".