668290 has 16 divisors (see below), whose sum is σ = 1374912. Its totient is φ = 229104.

The previous prime is 668273. The next prime is 668303. The reversal of 668290 is 92866.

It is a super-2 number, since 2×668290² = 893223048200, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

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, 4704 + ... + 4843.

It is an arithmetic number, because the mean of its divisors is an integer number (85932).

2⁶⁶⁸²⁹⁰ is an apocalyptic number.

668290 is an abundant number, since it is smaller than the sum of its proper divisors (706622).

It is a weird number, because it is abundant, but not a pseudoperfect number.

668290 is a wasteful number, since it uses less digits than its factorization.

668290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9561.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 668290 is about 817.4900611017. The cubic root of 668290 is about 87.4288946140.

The spelling of 668290 in words is "six hundred sixty-eight thousand, two hundred ninety".