28112112 has 90 divisors (see below), whose sum is σ = 90455768. Its totient is φ = 7983936.

The previous prime is 28112111. The next prime is 28112113. The reversal of 28112112 is 21121182.

It is an interprime number because it is at equal distance from previous prime (28112111) and next prime (28112113).

It is a super-2 number, since 2×28112112² = 1580581682201088, which contains 22 as substring.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28112111) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 168253 + ... + 168419.

Almost surely, 2^28112112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28112112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45227884).

28112112 is an abundant number, since it is smaller than the sum of its proper divisors (62343656).

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

28112112 is a wasteful number, since it uses less digits than its factorization.

28112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 179 counting only the distinct ones).

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

The square root of 28112112 is about 5302.0856273734. The cubic root of 28112112 is about 304.0636408775.

Adding to 28112112 its reverse (21121182), we get a palindrome (49233294).

It can be divided in two parts, 28112 and 112, that added together give a square (28224 = 168²).

The spelling of 28112112 in words is "twenty-eight million, one hundred twelve thousand, one hundred twelve".