28216882772 has 12 divisors (see below), whose sum is σ = 53177971476. Its totient is φ = 13023176640.

The previous prime is 28216882739. The next prime is 28216882781. The reversal of 28216882772 is 27728861282.

It can be written as a sum of positive squares in 2 ways, for example, as 10865143696 + 17351739076 = 104236^2 + 131726^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271316129 + ... + 271316232.

It is an arithmetic number, because the mean of its divisors is an integer number (4431497623).

Almost surely, 2^28216882772 is an apocalyptic number.

It is an amenable number.

28216882772 is a deficient number, since it is larger than the sum of its proper divisors (24961088704).

28216882772 is a wasteful number, since it uses less digits than its factorization.

28216882772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542632378 (or 542632376 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 53.

The spelling of 28216882772 in words is "twenty-eight billion, two hundred sixteen million, eight hundred eighty-two thousand, seven hundred seventy-two".