664389376 has 144 divisors (see below), whose sum is σ = 1627383744. Its totient is φ = 264241152.

The previous prime is 664389347. The next prime is 664389409. The reversal of 664389376 is 673983466.

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 15 ways as a sum of consecutive naturals, for example, 3442336 + ... + 3442528.

It is an arithmetic number, because the mean of its divisors is an integer number (11301276).

Almost surely, 2^664389376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664389376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (813691872).

664389376 is an abundant number, since it is smaller than the sum of its proper divisors (962994368).

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

664389376 is a wasteful number, since it uses less digits than its factorization.

664389376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 332 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 52.

The square root of 664389376 is about 25775.7517058184. The cubic root of 664389376 is about 872.5846316539.

The spelling of 664389376 in words is "six hundred sixty-four million, three hundred eighty-nine thousand, three hundred seventy-six".