28113 has 4 divisors (see below), whose sum is σ = 37488. Its totient is φ = 18740.

The previous prime is 28111. The next prime is 28123. The reversal of 28113 is 31182.

It is a happy number.

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 28113 - 2¹ = 28111 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 28092 and 28101.

It is not an unprimeable number, because it can be changed into a prime (28111) 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, 4683 + ... + 4688.

It is an arithmetic number, because the mean of its divisors is an integer number (9372).

2²⁸¹¹³ is an apocalyptic number.

It is an amenable number.

28113 is a deficient number, since it is larger than the sum of its proper divisors (9375).

28113 is an equidigital number, since it uses as much as digits as its factorization.

28113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9374.

The product of its digits is 48, while the sum is 15.

The square root of 28113 is about 167.6693174078. The cubic root of 28113 is about 30.4066842412.

Adding to 28113 its reverse (31182), we get a palindrome (59295).

It can be divided in two parts, 28 and 113, that added together give a palindrome (141).

The spelling of 28113 in words is "twenty-eight thousand, one hundred thirteen".