664289304 has 64 divisors (see below), whose sum is σ = 1902700800. Its totient is φ = 189323904.

The previous prime is 664289293. The next prime is 664289309. The reversal of 664289304 is 403982466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664289309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65674 + ... + 75110.

It is an arithmetic number, because the mean of its divisors is an integer number (29729700).

Almost surely, 2^664289304 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 664289304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951350400).

664289304 is an abundant number, since it is smaller than the sum of its proper divisors (1238411496).

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

664289304 is a wasteful number, since it uses less digits than its factorization.

664289304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9872 (or 9868 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 664289304 is about 25773.8104284174. The cubic root of 664289304 is about 872.5408191563.

The spelling of 664289304 in words is "six hundred sixty-four million, two hundred eighty-nine thousand, three hundred four".