66683720 has 32 divisors (see below), whose sum is σ = 150292800. Its totient is φ = 26628288.

The previous prime is 66683719. The next prime is 66683723. The reversal of 66683720 is 2738666.

66683720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66683723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32567 + ... + 34553.

It is an arithmetic number, because the mean of its divisors is an integer number (4696650).

Almost surely, 2^66683720 is an apocalyptic number.

It is an amenable number.

66683720 is an abundant number, since it is smaller than the sum of its proper divisors (83609080).

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

66683720 is a wasteful number, since it uses less digits than its factorization.

66683720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837 (or 2833 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 66683720 is about 8166.0100416299. The cubic root of 66683720 is about 405.5147040300.

The spelling of 66683720 in words is "sixty-six million, six hundred eighty-three thousand, seven hundred twenty".