664395 has 8 divisors (see below), whose sum is σ = 1063056. Its totient is φ = 354336.

The previous prime is 664381. The next prime is 664403. The reversal of 664395 is 593466.

It is a happy number.

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

It is not a de Polignac number, because 664395 - 2⁴ = 664379 is a prime.

It is a plaindrome in base 9.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664395.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22132 + ... + 22161.

It is an arithmetic number, because the mean of its divisors is an integer number (132882).

2⁶⁶⁴³⁹⁵ is an apocalyptic number.

664395 is a deficient number, since it is larger than the sum of its proper divisors (398661).

664395 is a wasteful number, since it uses less digits than its factorization.

664395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44301.

The product of its digits is 19440, while the sum is 33.

The square root of 664395 is about 815.1042878062. The cubic root of 664395 is about 87.2587093765.

The spelling of 664395 in words is "six hundred sixty-four thousand, three hundred ninety-five".