664807 has 8 divisors (see below), whose sum is σ = 781200. Its totient is φ = 557760.

The previous prime is 664799. The next prime is 664843. The reversal of 664807 is 708466.

664807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 664807 - 2³ = 664799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664847) 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, 2182 + ... + 2467.

It is an arithmetic number, because the mean of its divisors is an integer number (97650).

2⁶⁶⁴⁸⁰⁷ is an apocalyptic number.

664807 is a deficient number, since it is larger than the sum of its proper divisors (116393).

664807 is a wasteful number, since it uses less digits than its factorization.

664807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4673.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 664807 is about 815.3569770352. The cubic root of 664807 is about 87.2767424039.

The spelling of 664807 in words is "six hundred sixty-four thousand, eight hundred seven".