664321340 has 12 divisors (see below), whose sum is σ = 1395074856. Its totient is φ = 265728528.

The previous prime is 664321327. The next prime is 664321381. The reversal of 664321340 is 43123466.

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, 16608014 + ... + 16608053.

It is an arithmetic number, because the mean of its divisors is an integer number (116256238).

Almost surely, 2^664321340 is an apocalyptic number.

It is an amenable number.

664321340 is an abundant number, since it is smaller than the sum of its proper divisors (730753516).

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

664321340 is a wasteful number, since it uses less digits than its factorization.

664321340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33216076 (or 33216074 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 664321340 is about 25774.4319045057. The cubic root of 664321340 is about 872.5548453084.

The spelling of 664321340 in words is "six hundred sixty-four million, three hundred twenty-one thousand, three hundred forty".