668896 has 12 divisors (see below), whose sum is σ = 1316952. Its totient is φ = 334432.

The previous prime is 668879. The next prime is 668903. The reversal of 668896 is 698866.

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, 10420 + ... + 10483.

It is an arithmetic number, because the mean of its divisors is an integer number (109746).

2⁶⁶⁸⁸⁹⁶ is an apocalyptic number.

It is an amenable number.

668896 is a deficient number, since it is larger than the sum of its proper divisors (648056).

668896 is a wasteful number, since it uses less digits than its factorization.

668896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20913 (or 20905 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 668896 is about 817.8606238229. The cubic root of 668896 is about 87.4553132365.

The spelling of 668896 in words is "six hundred sixty-eight thousand, eight hundred ninety-six".