28516884889 has 4 divisors (see below), whose sum is σ = 30194348724. Its totient is φ = 26839421056.

The previous prime is 28516884883. The next prime is 28516884919. The reversal of 28516884889 is 98848861582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24840281664 + 3676603225 = 157608^2 + 60635^2 .

It is a cyclic number.

It is not a de Polignac number, because 28516884889 - 2³ = 28516884881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28516884881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838731892 + ... + 838731925.

It is an arithmetic number, because the mean of its divisors is an integer number (7548587181).

Almost surely, 2^28516884889 is an apocalyptic number.

It is an amenable number.

28516884889 is a deficient number, since it is larger than the sum of its proper divisors (1677463835).

28516884889 is a wasteful number, since it uses less digits than its factorization.

28516884889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677463834.

The product of its digits is 70778880, while the sum is 67.

The spelling of 28516884889 in words is "twenty-eight billion, five hundred sixteen million, eight hundred eighty-four thousand, eight hundred eighty-nine".