66720004 has 48 divisors (see below), whose sum is σ = 131326272. Its totient is φ = 29457792.

The previous prime is 66719971. The next prime is 66720011. The reversal of 66720004 is 40002766.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118227 + ... + 118789.

It is an arithmetic number, because the mean of its divisors is an integer number (2735964).

Almost surely, 2^66720004 is an apocalyptic number.

It is an amenable number.

66720004 is a deficient number, since it is larger than the sum of its proper divisors (64606268).

66720004 is a wasteful number, since it uses less digits than its factorization.

66720004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 66720004 is about 8168.2313875159. The cubic root of 66720004 is about 405.5882403576.

The spelling of 66720004 in words is "sixty-six million, seven hundred twenty thousand, four".