668717 has 4 divisors (see below), whose sum is σ = 764256. Its totient is φ = 573180.

The previous prime is 668713. The next prime is 668719. The reversal of 668717 is 717866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668717 - 2² = 668713 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 668717.

It is not an unprimeable number, because it can be changed into a prime (668713) 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, 47759 + ... + 47772.

It is an arithmetic number, because the mean of its divisors is an integer number (191064).

2⁶⁶⁸⁷¹⁷ is an apocalyptic number.

It is an amenable number.

668717 is a deficient number, since it is larger than the sum of its proper divisors (95539).

668717 is an equidigital number, since it uses as much as digits as its factorization.

668717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95538.

The product of its digits is 14112, while the sum is 35.

The square root of 668717 is about 817.7511846522. The cubic root of 668717 is about 87.4475113771.

The spelling of 668717 in words is "six hundred sixty-eight thousand, seven hundred seventeen".