668958 has 8 divisors (see below), whose sum is σ = 1337928. Its totient is φ = 222984.

The previous prime is 668947. The next prime is 668959. The reversal of 668958 is 859866.

668958 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.

668958 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668959) 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, 55741 + ... + 55752.

It is an arithmetic number, because the mean of its divisors is an integer number (167241).

2⁶⁶⁸⁹⁵⁸ is an apocalyptic number.

668958 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.

668958 is a wasteful number, since it uses less digits than its factorization.

668958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111498.

The product of its digits is 103680, while the sum is 42.

The square root of 668958 is about 817.8985267134. The cubic root of 668958 is about 87.4580152320.

The spelling of 668958 in words is "six hundred sixty-eight thousand, nine hundred fifty-eight".