668829 has 8 divisors (see below), whose sum is σ = 1019200. Its totient is φ = 382176.

The previous prime is 668821. The next prime is 668851. The reversal of 668829 is 928866.

668829 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668829 - 2³ = 668821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668821) 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, 15904 + ... + 15945.

It is an arithmetic number, because the mean of its divisors is an integer number (127400).

2⁶⁶⁸⁸²⁹ is an apocalyptic number.

It is an amenable number.

668829 is a deficient number, since it is larger than the sum of its proper divisors (350371).

668829 is a wasteful number, since it uses less digits than its factorization.

668829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31859.

The product of its digits is 41472, while the sum is 39.

The square root of 668829 is about 817.8196622728. The cubic root of 668829 is about 87.4523931505.

The spelling of 668829 in words is "six hundred sixty-eight thousand, eight hundred twenty-nine".