666324 has 36 divisors (see below), whose sum is σ = 1712256. Its totient is φ = 218448.

The previous prime is 666301. The next prime is 666329. The reversal of 666324 is 423666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2877 + ... + 3099.

2⁶⁶⁶³²⁴ 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 666324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856128).

666324 is an abundant number, since it is smaller than the sum of its proper divisors (1045932).

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

666324 is a wasteful number, since it uses less digits than its factorization.

666324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 311 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 666324 is about 816.2867143351. The cubic root of 666324 is about 87.3430765632.

It can be divided in two parts, 666 and 324, that added together give a triangular number (990 = T₄₄).

The spelling of 666324 in words is "six hundred sixty-six thousand, three hundred twenty-four".