668807 has 4 divisors (see below), whose sum is σ = 681480. Its totient is φ = 656136.

The previous prime is 668803. The next prime is 668813. The reversal of 668807 is 708866.

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 668807 - 2² = 668803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668807.

It is not an unprimeable number, because it can be changed into a prime (668803) 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, 6257 + ... + 6362.

It is an arithmetic number, because the mean of its divisors is an integer number (170370).

2⁶⁶⁸⁸⁰⁷ is an apocalyptic number.

668807 is a deficient number, since it is larger than the sum of its proper divisors (12673).

668807 is a wasteful number, since it uses less digits than its factorization.

668807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12672.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 668807 is about 817.8062117641. The cubic root of 668807 is about 87.4514342737.

The spelling of 668807 in words is "six hundred sixty-eight thousand, eight hundred seven".