28111122 has 36 divisors (see below), whose sum is σ = 65960154. Its totient is φ = 8648640.

The previous prime is 28111103. The next prime is 28111133. The reversal of 28111122 is 22111182.

It can be written as a sum of positive squares in 3 ways, for example, as 22953681 + 5157441 = 4791^2 + 2271^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 28111095 and 28111104.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1579 + ... + 7662.

Almost surely, 2^28111122 is an apocalyptic number.

28111122 is an abundant number, since it is smaller than the sum of its proper divisors (37849032).

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

28111122 is a wasteful number, since it uses less digits than its factorization.

28111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9275 (or 9259 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

The square root of 28111122 is about 5301.9922670634. The cubic root of 28111122 is about 304.0600715199.

The spelling of 28111122 in words is "twenty-eight million, one hundred eleven thousand, one hundred twenty-two".