664062320 has 40 divisors (see below), whose sum is σ = 1545171936. Its totient is φ = 265413888.

The previous prime is 664062319. The next prime is 664062323. The reversal of 664062320 is 23260466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664062323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132989 + ... + 137891.

Almost surely, 2^664062320 is an apocalyptic number.

It is an amenable number.

664062320 is an abundant number, since it is smaller than the sum of its proper divisors (881109616).

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

664062320 is a wasteful number, since it uses less digits than its factorization.

664062320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6609 (or 6603 counting only the distinct ones).

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

The square root of 664062320 is about 25769.4066675971. The cubic root of 664062320 is about 872.4414270359.

The spelling of 664062320 in words is "six hundred sixty-four million, sixty-two thousand, three hundred twenty".