668907 has 6 divisors (see below), whose sum is σ = 966212. Its totient is φ = 445932.

The previous prime is 668903. The next prime is 668929. The reversal of 668907 is 709866.

It is not a de Polignac number, because 668907 - 2² = 668903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37153 + ... + 37170.

2⁶⁶⁸⁹⁰⁷ is an apocalyptic number.

668907 is a deficient number, since it is larger than the sum of its proper divisors (297305).

668907 is a wasteful number, since it uses less digits than its factorization.

668907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74329 (or 74326 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 668907 is about 817.8673486575. The cubic root of 668907 is about 87.4557926350.

The spelling of 668907 in words is "six hundred sixty-eight thousand, nine hundred seven".