668384 has 12 divisors (see below), whose sum is σ = 1315944. Its totient is φ = 334176.

The previous prime is 668347. The next prime is 668407. The reversal of 668384 is 483866.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

668384 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10412 + ... + 10475.

It is an arithmetic number, because the mean of its divisors is an integer number (109662).

2⁶⁶⁸³⁸⁴ is an apocalyptic number.

It is an amenable number.

668384 is a deficient number, since it is larger than the sum of its proper divisors (647560).

668384 is a wasteful number, since it uses less digits than its factorization.

668384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20897 (or 20889 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 668384 is about 817.5475521338. The cubic root of 668384 is about 87.4329935984.

The spelling of 668384 in words is "six hundred sixty-eight thousand, three hundred eighty-four".