664689292 has 12 divisors (see below), whose sum is σ = 1169705880. Its totient is φ = 330487616.

The previous prime is 664689287. The next prime is 664689301. The reversal of 664689292 is 292986466.

It is a super-2 number, since 2×664689292² = 883623709798922528, which contains 22 as substring.

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, 463453 + ... + 464884.

It is an arithmetic number, because the mean of its divisors is an integer number (97475490).

Almost surely, 2^664689292 is an apocalyptic number.

It is an amenable number.

664689292 is a deficient number, since it is larger than the sum of its proper divisors (505016588).

664689292 is a wasteful number, since it uses less digits than its factorization.

664689292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928520 (or 928518 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 52.

The square root of 664689292 is about 25781.5688428769. The cubic root of 664689292 is about 872.7159114591.

The spelling of 664689292 in words is "six hundred sixty-four million, six hundred eighty-nine thousand, two hundred ninety-two".