678966 has 8 divisors (see below), whose sum is σ = 1357944. Its totient is φ = 226320.

The previous prime is 678959. The next prime is 678971. The reversal of 678966 is 669876.

It is a happy number.

678966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

678966 is an admirable number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56575 + ... + 56586.

It is an arithmetic number, because the mean of its divisors is an integer number (169743).

2⁶⁷⁸⁹⁶⁶ is an apocalyptic number.

678966 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.

678966 is a wasteful number, since it uses less digits than its factorization.

678966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113166.

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

The square root of 678966 is about 823.9939320165. The cubic root of 678966 is about 87.8919990491.

The spelling of 678966 in words is "six hundred seventy-eight thousand, nine hundred sixty-six".