28113317 has 4 divisors (see below), whose sum is σ = 28140876. Its totient is φ = 28085760.

The previous prime is 28113313. The next prime is 28113329. The reversal of 28113317 is 71331182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22572001 + 5541316 = 4751^2 + 2354^2 .

It is a cyclic number.

It is not a de Polignac number, because 28113317 - 2² = 28113313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28113313) 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, 12188 + ... + 14309.

It is an arithmetic number, because the mean of its divisors is an integer number (7035219).

Almost surely, 2^28113317 is an apocalyptic number.

It is an amenable number.

28113317 is a deficient number, since it is larger than the sum of its proper divisors (27559).

28113317 is a wasteful number, since it uses less digits than its factorization.

28113317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27558.

The product of its digits is 1008, while the sum is 26.

The square root of 28113317 is about 5302.1992606842. The cubic root of 28113317 is about 304.0679852855.

Adding to 28113317 its reverse (71331182), we get a palindrome (99444499).

The spelling of 28113317 in words is "twenty-eight million, one hundred thirteen thousand, three hundred seventeen".