664005 has 8 divisors (see below), whose sum is σ = 1062432. Its totient is φ = 354128.

The previous prime is 663997. The next prime is 664009. The reversal of 664005 is 500466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664005 - 2³ = 663997 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664005.

It is not an unprimeable number, because it can be changed into a prime (664009) 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, 22119 + ... + 22148.

It is an arithmetic number, because the mean of its divisors is an integer number (132804).

2⁶⁶⁴⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

664005 is a deficient number, since it is larger than the sum of its proper divisors (398427).

664005 is a wasteful number, since it uses less digits than its factorization.

664005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44275.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 664005 is about 814.8650194971. The cubic root of 664005 is about 87.2416324080.

The spelling of 664005 in words is "six hundred sixty-four thousand, five".