28718113 has 4 divisors (see below), whose sum is σ = 28749700. Its totient is φ = 28686528.

The previous prime is 28718093. The next prime is 28718119. The reversal of 28718113 is 31181782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31181782 = 2 ⋅15590891.

It can be written as a sum of positive squares in 2 ways, for example, as 966289 + 27751824 = 983^2 + 5268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28718113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28718119) by changing a digit.

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, 14388 + ... + 16261.

It is an arithmetic number, because the mean of its divisors is an integer number (7187425).

Almost surely, 2^28718113 is an apocalyptic number.

It is an amenable number.

28718113 is a deficient number, since it is larger than the sum of its proper divisors (31587).

28718113 is an equidigital number, since it uses as much as digits as its factorization.

28718113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31586.

The product of its digits is 2688, while the sum is 31.

The square root of 28718113 is about 5358.9283443614. The cubic root of 28718113 is about 306.2329843107.

Adding to 28718113 its reverse (31181782), we get a palindrome (59899895).

The spelling of 28718113 in words is "twenty-eight million, seven hundred eighteen thousand, one hundred thirteen".