66219328 has 28 divisors (see below), whose sum is σ = 150176992. Its totient is φ = 28379520.

The previous prime is 66219289. The next prime is 66219331. The reversal of 66219328 is 82391266.

66219328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 73458 + ... + 74353.

It is an arithmetic number, because the mean of its divisors is an integer number (5363464).

Almost surely, 2^66219328 is an apocalyptic number.

It is an amenable number.

66219328 is an abundant number, since it is smaller than the sum of its proper divisors (83957664).

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

66219328 is a wasteful number, since it uses less digits than its factorization.

66219328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147830 (or 147820 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 66219328 is about 8137.5259139372. The cubic root of 66219328 is about 404.5711621970.

The spelling of 66219328 in words is "sixty-six million, two hundred nineteen thousand, three hundred twenty-eight".