668967 has 16 divisors (see below), whose sum is σ = 1018080. Its totient is φ = 387072.

The previous prime is 668963. The next prime is 668989. The reversal of 668967 is 769866.

It is a happy number.

668967 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668967 - 2² = 668963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159 + ... + 1167.

It is an arithmetic number, because the mean of its divisors is an integer number (63630).

2⁶⁶⁸⁹⁶⁷ is an apocalyptic number.

668967 is a deficient number, since it is larger than the sum of its proper divisors (349113).

668967 is a wasteful number, since it uses less digits than its factorization.

668967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042.

The product of its digits is 108864, while the sum is 42.

The square root of 668967 is about 817.9040285999. The cubic root of 668967 is about 87.4584074433.

The spelling of 668967 in words is "six hundred sixty-eight thousand, nine hundred sixty-seven".