668620 has 24 divisors (see below), whose sum is σ = 1422288. Its totient is φ = 264000.

The previous prime is 668617. The next prime is 668623. The reversal of 668620 is 26866.

It is a happy number.

668620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (668617) and next prime (668623).

It is not an unprimeable number, because it can be changed into a prime (668623) 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, 1855 + ... + 2185.

It is an arithmetic number, because the mean of its divisors is an integer number (59262).

2⁶⁶⁸⁶²⁰ is an apocalyptic number.

It is an amenable number.

668620 is an abundant number, since it is smaller than the sum of its proper divisors (753668).

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

668620 is a wasteful number, since it uses less digits than its factorization.

668620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 668620 is about 817.6918735074. The cubic root of 668620 is about 87.4432829722.

The spelling of 668620 in words is "six hundred sixty-eight thousand, six hundred twenty".