668290321 has 8 divisors (see below), whose sum is σ = 684328320. Its totient is φ = 652328208.

The previous prime is 668290223. The next prime is 668290333. The reversal of 668290321 is 123092866.

668290321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 668290321 - 2²¹ = 666193169 is a prime.

It is a super-2 number, since 2×668290321² = 893223906284566082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668297321) 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, 946 + ... + 36571.

It is an arithmetic number, because the mean of its divisors is an integer number (85541040).

Almost surely, 2^668290321 is an apocalyptic number.

It is an amenable number.

668290321 is a deficient number, since it is larger than the sum of its proper divisors (16037999).

668290321 is a wasteful number, since it uses less digits than its factorization.

668290321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37943.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 668290321 is about 25851.3117848979. The cubic root of 668290321 is about 874.2890861227.

The spelling of 668290321 in words is "six hundred sixty-eight million, two hundred ninety thousand, three hundred twenty-one".