668028 has 24 divisors (see below), whose sum is σ = 1572480. Its totient is φ = 220720.

The previous prime is 668009. The next prime is 668029. The reversal of 668028 is 820866.

668028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×668028² = 892522817568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667986 and 668004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668029) 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, 1993 + ... + 2303.

It is an arithmetic number, because the mean of its divisors is an integer number (65520).

2⁶⁶⁸⁰²⁸ is an apocalyptic number.

It is an amenable number.

668028 is an abundant number, since it is smaller than the sum of its proper divisors (904452).

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

668028 is a wasteful number, since it uses less digits than its factorization.

668028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 668028 is about 817.3297987961. The cubic root of 668028 is about 87.4174677562.

The spelling of 668028 in words is "six hundred sixty-eight thousand, twenty-eight".