664689896 has 32 divisors (see below), whose sum is σ = 1358350560. Its totient is φ = 303079872.

The previous prime is 664689869. The next prime is 664689911. The reversal of 664689896 is 698986466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29870 + ... + 47133.

It is an arithmetic number, because the mean of its divisors is an integer number (42448455).

Almost surely, 2^664689896 is an apocalyptic number.

It is an amenable number.

664689896 is an abundant number, since it is smaller than the sum of its proper divisors (693660664).

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

664689896 is a wasteful number, since it uses less digits than its factorization.

664689896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77105 (or 77101 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 62.

The square root of 664689896 is about 25781.5805566687. The cubic root of 664689896 is about 872.7161758032.

The spelling of 664689896 in words is "six hundred sixty-four million, six hundred eighty-nine thousand, eight hundred ninety-six".