666204 has 72 divisors (see below), whose sum is σ = 1991808. Its totient is φ = 171360.

The previous prime is 666203. The next prime is 666229. The reversal of 666204 is 402666.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6417 + ... + 6519.

It is an arithmetic number, because the mean of its divisors is an integer number (27664).

2⁶⁶⁶²⁰⁴ 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 666204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (995904).

666204 is an abundant number, since it is smaller than the sum of its proper divisors (1325604).

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

666204 is a wasteful number, since it uses less digits than its factorization.

666204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 666204 is about 816.2132074403. The cubic root of 666204 is about 87.3378329688.

The spelling of 666204 in words is "six hundred sixty-six thousand, two hundred four".