28305113 has 4 divisors (see below), whose sum is σ = 28478928. Its totient is φ = 28131300.

The previous prime is 28305107. The next prime is 28305133. The reversal of 28305113 is 31150382.

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 28305113 - 2⁴ = 28305097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28305103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86663 + ... + 86988.

It is an arithmetic number, because the mean of its divisors is an integer number (7119732).

Almost surely, 2^28305113 is an apocalyptic number.

It is an amenable number.

28305113 is a deficient number, since it is larger than the sum of its proper divisors (173815).

28305113 is a wasteful number, since it uses less digits than its factorization.

28305113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173814.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 28305113 is about 5320.2549750928. The cubic root of 28305113 is about 304.7578944060.

Adding to 28305113 its reverse (31150382), we get a palindrome (59455495).

The spelling of 28305113 in words is "twenty-eight million, three hundred five thousand, one hundred thirteen".