66728896284 has 12 divisors (see below), whose sum is σ = 155700758024. Its totient is φ = 22242965424.

The previous prime is 66728896279. The next prime is 66728896291. The reversal of 66728896284 is 48269882766.

66728896284 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 (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2780370667 + ... + 2780370690.

Almost surely, 2^66728896284 is an apocalyptic number.

It is an amenable number.

66728896284 is an abundant number, since it is smaller than the sum of its proper divisors (88971861740).

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

66728896284 is a wasteful number, since it uses less digits than its factorization.

66728896284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560741364 (or 5560741362 counting only the distinct ones).

The product of its digits is 111476736, while the sum is 66.

The spelling of 66728896284 in words is "sixty-six billion, seven hundred twenty-eight million, eight hundred ninety-six thousand, two hundred eighty-four".