666640304 has 60 divisors (see below), whose sum is σ = 1429856400. Its totient is φ = 300854400.

The previous prime is 666640291. The next prime is 666640319. The reversal of 666640304 is 403046666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 287309 + ... + 289619.

It is an arithmetic number, because the mean of its divisors is an integer number (23830940).

Almost surely, 2^666640304 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 666640304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714928200).

666640304 is an abundant number, since it is smaller than the sum of its proper divisors (763216096).

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

666640304 is a wasteful number, since it uses less digits than its factorization.

666640304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490 (or 2473 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 666640304 is about 25819.3784588243. The cubic root of 666640304 is about 873.5689496292.

The spelling of 666640304 in words is "six hundred sixty-six million, six hundred forty thousand, three hundred four".