664339 has 6 divisors (see below), whose sum is σ = 719556. Its totient is φ = 613080.

The previous prime is 664331. The next prime is 664357. The reversal of 664339 is 933466.

664339 = 51² + 52² + ... + 128².

It is not a de Polignac number, because 664339 - 2³ = 664331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664339.

It is not an unprimeable number, because it can be changed into a prime (664331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1797 + ... + 2134.

It is an arithmetic number, because the mean of its divisors is an integer number (119926).

2⁶⁶⁴³³⁹ is an apocalyptic number.

664339 is a deficient number, since it is larger than the sum of its proper divisors (55217).

664339 is a wasteful number, since it uses less digits than its factorization.

664339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957 (or 3944 counting only the distinct ones).

The product of its digits is 11664, while the sum is 31.

The square root of 664339 is about 815.0699356497. The cubic root of 664339 is about 87.2562577100.

The spelling of 664339 in words is "six hundred sixty-four thousand, three hundred thirty-nine".