664835 has 4 divisors (see below), whose sum is σ = 797808. Its totient is φ = 531864.

The previous prime is 664799. The next prime is 664843. The reversal of 664835 is 538466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664835 - 2⁶ = 664771 is a prime.

It is a super-3 number, since 3×664835³ = 881582333803148625, which contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66479 + ... + 66488.

It is an arithmetic number, because the mean of its divisors is an integer number (199452).

2⁶⁶⁴⁸³⁵ is an apocalyptic number.

664835 is a deficient number, since it is larger than the sum of its proper divisors (132973).

664835 is a wasteful number, since it uses less digits than its factorization.

664835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132972.

The product of its digits is 17280, while the sum is 32.

The square root of 664835 is about 815.3741472478. The cubic root of 664835 is about 87.2779676791.

The spelling of 664835 in words is "six hundred sixty-four thousand, eight hundred thirty-five".