664384 has 28 divisors (see below), whose sum is σ = 1507744. Its totient is φ = 284544.

The previous prime is 664381. The next prime is 664403. The reversal of 664384 is 483466.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (53848).

2⁶⁶⁴³⁸⁴ is an apocalyptic number.

664384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664384 is an abundant number, since it is smaller than the sum of its proper divisors (843360).

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

664384 is a wasteful number, since it uses less digits than its factorization.

664384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1492 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 664384 is about 815.0975401754. The cubic root of 664384 is about 87.2582278101.

The spelling of 664384 in words is "six hundred sixty-four thousand, three hundred eighty-four".