28134817 has 4 divisors (see below), whose sum is σ = 28297620. Its totient is φ = 27972016.

The previous prime is 28134809. The next prime is 28134829. The reversal of 28134817 is 71843182.

It is a happy number.

28134817 is nontrivially palindromic in base 16.

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 25441936 + 2692881 = 5044^2 + 1641^2 .

It is a cyclic number.

It is not a de Polignac number, because 28134817 - 2³ = 28134809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28134217) 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, 81142 + ... + 81487.

It is an arithmetic number, because the mean of its divisors is an integer number (7074405).

Almost surely, 2^28134817 is an apocalyptic number.

It is an amenable number.

28134817 is a deficient number, since it is larger than the sum of its proper divisors (162803).

28134817 is a wasteful number, since it uses less digits than its factorization.

28134817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162802.

The product of its digits is 10752, while the sum is 34.

The square root of 28134817 is about 5304.2263337833. The cubic root of 28134817 is about 304.1454787601.

Adding to 28134817 its reverse (71843182), we get a palindrome (99977999).

The spelling of 28134817 in words is "twenty-eight million, one hundred thirty-four thousand, eight hundred seventeen".