668289 has 8 divisors (see below), whose sum is σ = 895072. Its totient is φ = 443520.

The previous prime is 668273. The next prime is 668303. The reversal of 668289 is 982866.

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

It is not a de Polignac number, because 668289 - 2⁴ = 668273 is a prime.

It is a super-2 number, since 2×668289² = 893220375042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (668209) 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, 657 + ... + 1329.

It is an arithmetic number, because the mean of its divisors is an integer number (111884).

2⁶⁶⁸²⁸⁹ is an apocalyptic number.

It is an amenable number.

668289 is a deficient number, since it is larger than the sum of its proper divisors (226783).

668289 is a wasteful number, since it uses less digits than its factorization.

668289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007.

The product of its digits is 41472, while the sum is 39.

The square root of 668289 is about 817.4894494732. The cubic root of 668289 is about 87.4288510057.

The spelling of 668289 in words is "six hundred sixty-eight thousand, two hundred eighty-nine".