668860 has 24 divisors (see below), whose sum is σ = 1433376. Its totient is φ = 262080.

The previous prime is 668851. The next prime is 668867. The reversal of 668860 is 68866.

It is a happy number.

668860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (59724).

2⁶⁶⁸⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

668860 is an abundant number, since it is smaller than the sum of its proper divisors (764516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668860 is a wasteful number, since it uses less digits than its factorization.

668860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 668860 is about 817.8386148868. The cubic root of 668860 is about 87.4537442593.

The spelling of 668860 in words is "six hundred sixty-eight thousand, eight hundred sixty".