28111113 has 12 divisors (see below), whose sum is σ = 40704768. Its totient is φ = 18694680.

The previous prime is 28111103. The next prime is 28111133. The reversal of 28111113 is 31111182.

It is a happy number.

It is not a de Polignac number, because 28111113 - 2⁶ = 28111049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28111103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 256 + ... + 7502.

It is an arithmetic number, because the mean of its divisors is an integer number (3392064).

Almost surely, 2^28111113 is an apocalyptic number.

It is an amenable number.

28111113 is a deficient number, since it is larger than the sum of its proper divisors (12593655).

28111113 is a wasteful number, since it uses less digits than its factorization.

28111113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7684 (or 7681 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 28111113 is about 5301.9914183258. The cubic root of 28111113 is about 304.0600390708.

Adding to 28111113 its reverse (31111182), we get a palindrome (59222295).

It can be divided in two parts, 28111 and 113, that added together give a square (28224 = 168²).

The spelling of 28111113 in words is "twenty-eight million, one hundred eleven thousand, one hundred thirteen".