668974 has 4 divisors (see below), whose sum is σ = 1003464. Its totient is φ = 334486.

The previous prime is 668963. The next prime is 668989. The reversal of 668974 is 479866.

668974 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 479866 = 2 ⋅239933.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167242 + ... + 167245.

It is an arithmetic number, because the mean of its divisors is an integer number (250866).

2⁶⁶⁸⁹⁷⁴ is an apocalyptic number.

668974 is a deficient number, since it is larger than the sum of its proper divisors (334490).

668974 is a wasteful number, since it uses less digits than its factorization.

668974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334489.

The product of its digits is 72576, while the sum is 40.

The square root of 668974 is about 817.9083078194. The cubic root of 668974 is about 87.4587124940.

The spelling of 668974 in words is "six hundred sixty-eight thousand, nine hundred seventy-four".