668705 has 8 divisors (see below), whose sum is σ = 844800. Its totient is φ = 506736.

The previous prime is 668699. The next prime is 668713. The reversal of 668705 is 507866.

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 668705 - 2¹⁴ = 652321 is a prime.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 3425 + ... + 3614.

It is an arithmetic number, because the mean of its divisors is an integer number (105600).

2⁶⁶⁸⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

668705 is a deficient number, since it is larger than the sum of its proper divisors (176095).

668705 is a wasteful number, since it uses less digits than its factorization.

668705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7063.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 668705 is about 817.7438474241. The cubic root of 668705 is about 87.4469882976.

The spelling of 668705 in words is "six hundred sixty-eight thousand, seven hundred five".