66640204 has 48 divisors (see below), whose sum is σ = 129136896. Its totient is φ = 29952000.

The previous prime is 66640199. The next prime is 66640229. The reversal of 66640204 is 40204666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212752 + ... + 213064.

It is an arithmetic number, because the mean of its divisors is an integer number (2690352).

Almost surely, 2^66640204 is an apocalyptic number.

It is an amenable number.

66640204 is a deficient number, since it is larger than the sum of its proper divisors (62496692).

66640204 is a wasteful number, since it uses less digits than its factorization.

66640204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66640204 is about 8163.3451476708. The cubic root of 66640204 is about 405.4264755100.

The spelling of 66640204 in words is "sixty-six million, six hundred forty thousand, two hundred four".