667868 has 6 divisors (see below), whose sum is σ = 1168776. Its totient is φ = 333932.

The previous prime is 667867. The next prime is 667883. The reversal of 667868 is 868766.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83480 + ... + 83487.

It is an arithmetic number, because the mean of its divisors is an integer number (194796).

2⁶⁶⁷⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

667868 is a deficient number, since it is larger than the sum of its proper divisors (500908).

667868 is a wasteful number, since it uses less digits than its factorization.

667868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166971 (or 166969 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 667868 is about 817.2319132290. The cubic root of 667868 is about 87.4104880529.

The spelling of 667868 in words is "six hundred sixty-seven thousand, eight hundred sixty-eight".