28112222889 has 9 divisors (see below), whose sum is σ = 40607270743. Its totient is φ = 18741146592.

The previous prime is 28112222881. The next prime is 28112222899. The reversal of 28112222889 is 98822221182.

The square root of 28112222889 is 167667.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 24985176489 + 3127046400 = 158067^2 + 55920^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 28112222889 - 2³ = 28112222881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28112222881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 475057 + ... + 530945.

Almost surely, 2^28112222889 is an apocalyptic number.

28112222889 is the 167667-th square number.

28112222889 is the 83834-th centered octagonal number.

It is an amenable number.

28112222889 is a deficient number, since it is larger than the sum of its proper divisors (12495047854).

28112222889 is an frugal number, since it uses more digits than its factorization.

28112222889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111784 (or 55892 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

It can be divided in two parts, 28112 and 222889, that added together give a square (251001 = 501²).

The spelling of 28112222889 in words is "twenty-eight billion, one hundred twelve million, two hundred twenty-two thousand, eight hundred eighty-nine".