666309924 has 72 divisors (see below), whose sum is σ = 1942012800. Its totient is φ = 188681472.

The previous prime is 666309881. The next prime is 666309953. The reversal of 666309924 is 429903666.

666309924 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 666309924.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16777 + ... + 40175.

It is an arithmetic number, because the mean of its divisors is an integer number (26972400).

Almost surely, 2^666309924 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 666309924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971006400).

666309924 is an abundant number, since it is smaller than the sum of its proper divisors (1275702876).

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

666309924 is a wasteful number, since it uses less digits than its factorization.

666309924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23529 (or 23524 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 666309924 is about 25812.9797582534. The cubic root of 666309924 is about 873.4246152216.

The spelling of 666309924 in words is "six hundred sixty-six million, three hundred nine thousand, nine hundred twenty-four".