664327 has 4 divisors (see below), whose sum is σ = 670320. Its totient is φ = 658336.

The previous prime is 664319. The next prime is 664331. The reversal of 664327 is 723466.

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 664327 - 2³ = 664319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664295 and 664304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827 + ... + 3052.

It is an arithmetic number, because the mean of its divisors is an integer number (167580).

2⁶⁶⁴³²⁷ is an apocalyptic number.

664327 is a deficient number, since it is larger than the sum of its proper divisors (5993).

664327 is a wasteful number, since it uses less digits than its factorization.

664327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5992.

The product of its digits is 6048, while the sum is 28.

The square root of 664327 is about 815.0625742849. The cubic root of 664327 is about 87.2557323349.

It can be divided in two parts, 6643 and 27, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 664327 in words is "six hundred sixty-four thousand, three hundred twenty-seven".