668206 has 16 divisors (see below), whose sum is σ = 1249920. Its totient is φ = 260280.

The previous prime is 668203. The next prime is 668209. The reversal of 668206 is 602866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (668203) and next prime (668209).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668201) 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, 2016 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (78120).

2⁶⁶⁸²⁰⁶ is an apocalyptic number.

668206 is a deficient number, since it is larger than the sum of its proper divisors (581714).

668206 is a wasteful number, since it uses less digits than its factorization.

668206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4359.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 668206 is about 817.4386827157. The cubic root of 668206 is about 87.4252313666.

The spelling of 668206 in words is "six hundred sixty-eight thousand, two hundred six".