668768 has 12 divisors (see below), whose sum is σ = 1316700. Its totient is φ = 334368.

The previous prime is 668761. The next prime is 668791. The reversal of 668768 is 867866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668761) by changing a digit.

668768 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10418 + ... + 10481.

It is an arithmetic number, because the mean of its divisors is an integer number (109725).

2⁶⁶⁸⁷⁶⁸ is an apocalyptic number.

It is an amenable number.

668768 is a deficient number, since it is larger than the sum of its proper divisors (647932).

668768 is a wasteful number, since it uses less digits than its factorization.

668768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20909 (or 20901 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 668768 is about 817.7823671369. The cubic root of 668768 is about 87.4497343951.

The spelling of 668768 in words is "six hundred sixty-eight thousand, seven hundred sixty-eight".