668287 has 8 divisors (see below), whose sum is σ = 745200. Its totient is φ = 595584.

The previous prime is 668273. The next prime is 668303. The reversal of 668287 is 782866.

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 668287 - 2⁷ = 668159 is a prime.

It is a Duffinian number.

668287 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712 + ... + 1357.

It is an arithmetic number, because the mean of its divisors is an integer number (93150).

2⁶⁶⁸²⁸⁷ is an apocalyptic number.

668287 is a deficient number, since it is larger than the sum of its proper divisors (76913).

668287 is a wasteful number, since it uses less digits than its factorization.

668287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105.

The product of its digits is 32256, while the sum is 37.

The square root of 668287 is about 817.4882262149. The cubic root of 668287 is about 87.4287637890.

The spelling of 668287 in words is "six hundred sixty-eight thousand, two hundred eighty-seven".