668707 has 4 divisors (see below), whose sum is σ = 720160. Its totient is φ = 617256.

The previous prime is 668699. The next prime is 668713. The reversal of 668707 is 707866.

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 668707 - 2³ = 668699 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (668737) 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, 25707 + ... + 25732.

It is an arithmetic number, because the mean of its divisors is an integer number (180040).

2⁶⁶⁸⁷⁰⁷ is an apocalyptic number.

668707 is a deficient number, since it is larger than the sum of its proper divisors (51453).

668707 is a wasteful number, since it uses less digits than its factorization.

668707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51452.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 668707 is about 817.7450703000. The cubic root of 668707 is about 87.4470754780.

The spelling of 668707 in words is "six hundred sixty-eight thousand, seven hundred seven".