668789 has 8 divisors (see below), whose sum is σ = 736032. Its totient is φ = 602640.

The previous prime is 668761. The next prime is 668791. The reversal of 668789 is 987866.

668789 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 a cyclic number.

It is not a de Polignac number, because 668789 - 2⁸ = 668533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668719) 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, 1607 + ... + 1979.

It is an arithmetic number, because the mean of its divisors is an integer number (92004).

2⁶⁶⁸⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

668789 is a deficient number, since it is larger than the sum of its proper divisors (67243).

668789 is a wasteful number, since it uses less digits than its factorization.

668789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547.

The product of its digits is 145152, while the sum is 44.

The square root of 668789 is about 817.7952066379. The cubic root of 668789 is about 87.4506497225.

It can be divided in two parts, 6687 and 89, that added together give a palindrome (6776).

The spelling of 668789 in words is "six hundred sixty-eight thousand, seven hundred eighty-nine".