28315311 has 4 divisors (see below), whose sum is σ = 37753752. Its totient is φ = 18876872.

The previous prime is 28315289. The next prime is 28315327. The reversal of 28315311 is 11351382.

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

It is a cyclic number.

It is not a de Polignac number, because 28315311 - 2⁶ = 28315247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28315361) 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, 4719216 + ... + 4719221.

It is an arithmetic number, because the mean of its divisors is an integer number (9438438).

Almost surely, 2^28315311 is an apocalyptic number.

28315311 is a deficient number, since it is larger than the sum of its proper divisors (9438441).

28315311 is an equidigital number, since it uses as much as digits as its factorization.

28315311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9438440.

The product of its digits is 720, while the sum is 24.

The square root of 28315311 is about 5321.2133014943. The cubic root of 28315311 is about 304.7944902422.

Adding to 28315311 its reverse (11351382), we get a palindrome (39666693).

The spelling of 28315311 in words is "twenty-eight million, three hundred fifteen thousand, three hundred eleven".