666344 has 32 divisors (see below), whose sum is σ = 1456320. Its totient is φ = 279936.

The previous prime is 666329. The next prime is 666353. The reversal of 666344 is 443666.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4007 + ... + 4169.

It is an arithmetic number, because the mean of its divisors is an integer number (45510).

2⁶⁶⁶³⁴⁴ 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 666344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728160).

666344 is an abundant number, since it is smaller than the sum of its proper divisors (789976).

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

666344 is a wasteful number, since it uses less digits than its factorization.

666344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 245 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 666344 is about 816.2989648407. The cubic root of 666344 is about 87.3439504344.

The spelling of 666344 in words is "six hundred sixty-six thousand, three hundred forty-four".