28082772783821 has 16 divisors (see below), whose sum is σ = 33999067874304. Its totient is φ = 22643974704384.

The previous prime is 28082772783811. The next prime is 28082772783869. The reversal of 28082772783821 is 12838727728082.

It is a cyclic number.

It is not a de Polignac number, because 28082772783821 - 2³⁰ = 28081699041997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28082772783811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57230045 + ... + 57718658.

It is an arithmetic number, because the mean of its divisors is an integer number (2124941742144).

Almost surely, 2^{28082772783821} is an apocalyptic number.

It is an amenable number.

28082772783821 is a deficient number, since it is larger than the sum of its proper divisors (5916295090483).

28082772783821 is a wasteful number, since it uses less digits than its factorization.

28082772783821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114950780.

The product of its (nonzero) digits is 67436544, while the sum is 65.

The spelling of 28082772783821 in words is "twenty-eight trillion, eighty-two billion, seven hundred seventy-two million, seven hundred eighty-three thousand, eight hundred twenty-one".