664886 has 8 divisors (see below), whose sum is σ = 1049880. Its totient is φ = 314928.

The previous prime is 664879. The next prime is 664891. The reversal of 664886 is 688466.

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

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 17497 = 664886 / (6 + 6 + 4 + 8 + 8 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8711 + ... + 8786.

It is an arithmetic number, because the mean of its divisors is an integer number (131235).

2⁶⁶⁴⁸⁸⁶ is an apocalyptic number.

664886 is a deficient number, since it is larger than the sum of its proper divisors (384994).

664886 is a wasteful number, since it uses less digits than its factorization.

664886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17518.

The product of its digits is 55296, while the sum is 38.

The square root of 664886 is about 815.4054206344. The cubic root of 664886 is about 87.2801993418.

The spelling of 664886 in words is "six hundred sixty-four thousand, eight hundred eighty-six".