667996 has 12 divisors (see below), whose sum is σ = 1336048. Its totient is φ = 286272.

The previous prime is 667991. The next prime is 667999. The reversal of 667996 is 699766.

It is a happy number.

667996 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11901 + ... + 11956.

2⁶⁶⁷⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

667996 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

667996 is a wasteful number, since it uses less digits than its factorization.

667996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23868 (or 23866 counting only the distinct ones).

The product of its digits is 122472, while the sum is 43.

The square root of 667996 is about 817.3102226205. The cubic root of 667996 is about 87.4160719047.

The spelling of 667996 in words is "six hundred sixty-seven thousand, nine hundred ninety-six".