28203113 has 4 divisors (see below), whose sum is σ = 28315728. Its totient is φ = 28090500.

The previous prime is 28203107. The next prime is 28203137. The reversal of 28203113 is 31130282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28203113 - 2⁸ = 28202857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28200113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55931 + ... + 56432.

It is an arithmetic number, because the mean of its divisors is an integer number (7078932).

Almost surely, 2^28203113 is an apocalyptic number.

It is an amenable number.

28203113 is a deficient number, since it is larger than the sum of its proper divisors (112615).

28203113 is a wasteful number, since it uses less digits than its factorization.

28203113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112614.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 28203113 is about 5310.6603167591. The cubic root of 28203113 is about 304.3913797093.

Adding to 28203113 its reverse (31130282), we get a palindrome (59333395).

The spelling of 28203113 in words is "twenty-eight million, two hundred three thousand, one hundred thirteen".