28113113 has 6 divisors (see below), whose sum is σ = 32703066. Its totient is φ = 24096912.

The previous prime is 28113109. The next prime is 28113119. The reversal of 28113113 is 31131182.

It can be written as a sum of positive squares in only one way, i.e., 26543104 + 1570009 = 5152^2 + 1253^2 .

It is not a de Polignac number, because 28113113 - 2² = 28113109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28113119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 286820 + ... + 286917.

It is an arithmetic number, because the mean of its divisors is an integer number (5450511).

Almost surely, 2^28113113 is an apocalyptic number.

It is an amenable number.

28113113 is a deficient number, since it is larger than the sum of its proper divisors (4589953).

28113113 is an equidigital number, since it uses as much as digits as its factorization.

28113113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573751 (or 573744 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

The square root of 28113113 is about 5302.1800233489. The cubic root of 28113113 is about 304.0672498093.

Adding to 28113113 its reverse (31131182), we get a palindrome (59244295).

The spelling of 28113113 in words is "twenty-eight million, one hundred thirteen thousand, one hundred thirteen".