668006 has 8 divisors (see below), whose sum is σ = 1005480. Its totient is φ = 332848.

The previous prime is 667999. The next prime is 668009. The reversal of 668006 is 600866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668009) 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, 845 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (125685).

2⁶⁶⁸⁰⁰⁶ is an apocalyptic number.

668006 is a deficient number, since it is larger than the sum of its proper divisors (337474).

668006 is a wasteful number, since it uses less digits than its factorization.

668006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 668006 is about 817.3163402257. The cubic root of 668006 is about 87.4165081131.

The spelling of 668006 in words is "six hundred sixty-eight thousand, six".