28271317 has 4 divisors (see below), whose sum is σ = 29246220. Its totient is φ = 27296416.

The previous prime is 28271311. The next prime is 28271359. The reversal of 28271317 is 71317282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71317282 = 2 ⋅35658641.

It can be written as a sum of positive squares in 2 ways, for example, as 5317636 + 22953681 = 2306^2 + 4791^2 .

It is a cyclic number.

It is not a de Polignac number, because 28271317 - 2⁷ = 28271189 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 (28271311) 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, 487408 + ... + 487465.

It is an arithmetic number, because the mean of its divisors is an integer number (7311555).

Almost surely, 2^28271317 is an apocalyptic number.

It is an amenable number.

28271317 is a deficient number, since it is larger than the sum of its proper divisors (974903).

28271317 is an equidigital number, since it uses as much as digits as its factorization.

28271317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974902.

The product of its digits is 4704, while the sum is 31.

The square root of 28271317 is about 5317.0778628867. The cubic root of 28271317 is about 304.6365535523.

Adding to 28271317 its reverse (71317282), we get a palindrome (99588599).

The spelling of 28271317 in words is "twenty-eight million, two hundred seventy-one thousand, three hundred seventeen".