668106 has 12 divisors (see below), whose sum is σ = 1447602. Its totient is φ = 222696.

The previous prime is 668093. The next prime is 668111. The reversal of 668106 is 601866.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 119025 = 741^2 + 345^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 668106.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668106.

It is an unprimeable number.

668106 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 in 5 ways as a sum of consecutive naturals, for example, 18541 + ... + 18576.

2⁶⁶⁸¹⁰⁶ is an apocalyptic number.

668106 is an abundant number, since it is smaller than the sum of its proper divisors (779496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668106 is a wasteful number, since it uses less digits than its factorization.

668106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37125 (or 37122 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 668106 is about 817.3775137597. The cubic root of 668106 is about 87.4208699574.

The spelling of 668106 in words is "six hundred sixty-eight thousand, one hundred six".