668982 has 8 divisors (see below), whose sum is σ = 1337976. Its totient is φ = 222992.

The previous prime is 668963. The next prime is 668989. The reversal of 668982 is 289866.

668982 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.

668982 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 668982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668989) 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, 55743 + ... + 55754.

It is an arithmetic number, because the mean of its divisors is an integer number (167247).

2⁶⁶⁸⁹⁸² is an apocalyptic number.

668982 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.

668982 is a wasteful number, since it uses less digits than its factorization.

668982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111502.

The product of its digits is 41472, while the sum is 39.

The square root of 668982 is about 817.9131983285. The cubic root of 668982 is about 87.4590611209.

The spelling of 668982 in words is "six hundred sixty-eight thousand, nine hundred eighty-two".