28111872 has 44 divisors (see below), whose sum is σ = 74936576. Its totient is φ = 9369600.

The previous prime is 28111871. The next prime is 28111873. The reversal of 28111872 is 27811182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28111871) and next prime (28111873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28111871) 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, 1504 + ... + 7647.

It is an arithmetic number, because the mean of its divisors is an integer number (1703104).

Almost surely, 2^28111872 is an apocalyptic number.

It is an amenable number.

28111872 is an abundant number, since it is smaller than the sum of its proper divisors (46824704).

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

28111872 is an equidigital number, since it uses as much as digits as its factorization.

28111872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9174 (or 9156 counting only the distinct ones).

The product of its digits is 1792, while the sum is 30.

The square root of 28111872 is about 5302.0629947220. The cubic root of 28111872 is about 304.0627755864.

The spelling of 28111872 in words is "twenty-eight million, one hundred eleven thousand, eight hundred seventy-two".