664681952 has 24 divisors (see below), whose sum is σ = 1427556312. Its totient is φ = 302128000.

The previous prime is 664681939. The next prime is 664681973. The reversal of 664681952 is 259186466.

It is a junction number, because it is equal to n+sod(n) for n = 664681897 and 664681906.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 943799 + ... + 944502.

It is an arithmetic number, because the mean of its divisors is an integer number (59481513).

Almost surely, 2^664681952 is an apocalyptic number.

It is an amenable number.

664681952 is an abundant number, since it is smaller than the sum of its proper divisors (762874360).

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

664681952 is a wasteful number, since it uses less digits than its factorization.

664681952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888322 (or 1888314 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 664681952 is about 25781.4264927292. The cubic root of 664681952 is about 872.7126990517.

The spelling of 664681952 in words is "six hundred sixty-four million, six hundred eighty-one thousand, nine hundred fifty-two".