668068 has 6 divisors (see below), whose sum is σ = 1169126. Its totient is φ = 334032.

The previous prime is 668051. The next prime is 668069. The reversal of 668068 is 860866.

It is a happy number.

668068 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 40804 = 792^2 + 202^2 .

It is not an unprimeable number, because it can be changed into a prime (668069) by changing a digit.

668068 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83505 + ... + 83512.

2⁶⁶⁸⁰⁶⁸ is an apocalyptic number.

It is an amenable number.

668068 is a deficient number, since it is larger than the sum of its proper divisors (501058).

668068 is a wasteful number, since it uses less digits than its factorization.

668068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167021 (or 167019 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 668068 is about 817.3542683561. The cubic root of 668068 is about 87.4192125079.

The spelling of 668068 in words is "six hundred sixty-eight thousand, sixty-eight".