28317213 has 12 divisors (see below), whose sum is σ = 41051868. Its totient is φ = 18809280.

The previous prime is 28317203. The next prime is 28317217. The reversal of 28317213 is 31271382.

It can be written as a sum of positive squares in 2 ways, for example, as 12659364 + 15657849 = 3558^2 + 3957^2 .

It is not a de Polignac number, because 28317213 - 2⁸ = 28316957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28317217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3070 + ... + 8127.

It is an arithmetic number, because the mean of its divisors is an integer number (3420989).

Almost surely, 2^28317213 is an apocalyptic number.

It is an amenable number.

28317213 is a deficient number, since it is larger than the sum of its proper divisors (12734655).

28317213 is a wasteful number, since it uses less digits than its factorization.

28317213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11484 (or 11481 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 28317213 is about 5321.3920171324. The cubic root of 28317213 is about 304.8013146553.

Adding to 28317213 its reverse (31271382), we get a palindrome (59588595).

The spelling of 28317213 in words is "twenty-eight million, three hundred seventeen thousand, two hundred thirteen".