667717 has 8 divisors (see below), whose sum is σ = 711360. Its totient is φ = 624960.

The previous prime is 667699. The next prime is 667727. The reversal of 667717 is 717766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667727) by changing a digit.

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, 1992 + ... + 2302.

It is an arithmetic number, because the mean of its divisors is an integer number (88920).

2⁶⁶⁷⁷¹⁷ is an apocalyptic number.

It is an amenable number.

667717 is a deficient number, since it is larger than the sum of its proper divisors (43643).

667717 is a wasteful number, since it uses less digits than its factorization.

667717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its digits is 12348, while the sum is 34.

The square root of 667717 is about 817.1395229702. The cubic root of 667717 is about 87.4038999354.

The spelling of 667717 in words is "six hundred sixty-seven thousand, seven hundred seventeen".