664297880 has 16 divisors (see below), whose sum is σ = 1494670320. Its totient is φ = 265719136.

The previous prime is 664297849. The next prime is 664297897. The reversal of 664297880 is 88792466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8303684 + ... + 8303763.

It is an arithmetic number, because the mean of its divisors is an integer number (93416895).

Almost surely, 2^664297880 is an apocalyptic number.

It is an amenable number.

664297880 is an abundant number, since it is smaller than the sum of its proper divisors (830372440).

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

664297880 is a wasteful number, since it uses less digits than its factorization.

664297880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16607458 (or 16607454 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 664297880 is about 25773.9767983134. The cubic root of 664297880 is about 872.5445739852.

The spelling of 664297880 in words is "six hundred sixty-four million, two hundred ninety-seven thousand, eight hundred eighty".