668844 has 48 divisors (see below), whose sum is σ = 1895040. Its totient is φ = 202320.

The previous prime is 668821. The next prime is 668851. The reversal of 668844 is 448866.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 668799 and 668808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 907 + ... + 1469.

It is an arithmetic number, because the mean of its divisors is an integer number (39480).

2⁶⁶⁸⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (947520).

668844 is an abundant number, since it is smaller than the sum of its proper divisors (1226196).

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

668844 is a wasteful number, since it uses less digits than its factorization.

668844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587 (or 579 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 668844 is about 817.8288329473. The cubic root of 668844 is about 87.4530469180.

The spelling of 668844 in words is "six hundred sixty-eight thousand, eight hundred forty-four".