28111112 has 16 divisors (see below), whose sum is σ = 52978860. Its totient is φ = 13983424.

The previous prime is 28111103. The next prime is 28111133. The reversal of 28111112 is 21111182.

It can be written as a sum of positive squares in 2 ways, for example, as 21215236 + 6895876 = 4606^2 + 2626^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7343 + ... + 10494.

Almost surely, 2^28111112 is an apocalyptic number.

It is an amenable number.

28111112 is a deficient number, since it is larger than the sum of its proper divisors (24867748).

28111112 is a wasteful number, since it uses less digits than its factorization.

28111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18040 (or 18036 counting only the distinct ones).

The product of its digits is 32, while the sum is 17.

The square root of 28111112 is about 5301.9913240216. The cubic root of 28111112 is about 304.0600354654.

Adding to 28111112 its reverse (21111182), we get a palindrome (49222294).

The spelling of 28111112 in words is "twenty-eight million, one hundred eleven thousand, one hundred twelve".