664305 has 16 divisors (see below), whose sum is σ = 1080384. Its totient is φ = 348480.

The previous prime is 664289. The next prime is 664319. The reversal of 664305 is 503466.

It is not a de Polignac number, because 664305 - 2⁴ = 664289 is a prime.

It is a super-2 number, since 2×664305² = 882602266050, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675 + ... + 1335.

It is an arithmetic number, because the mean of its divisors is an integer number (67524).

2⁶⁶⁴³⁰⁵ is an apocalyptic number.

It is an amenable number.

664305 is a deficient number, since it is larger than the sum of its proper divisors (416079).

664305 is a wasteful number, since it uses less digits than its factorization.

664305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 664305 is about 815.0490782769. The cubic root of 664305 is about 87.2547691309.

It can be divided in two parts, 664 and 305, that added together give a palindrome (969).

The spelling of 664305 in words is "six hundred sixty-four thousand, three hundred five".