28213313 has 2 divisors, whose sum is σ = 28213314. Its totient is φ = 28213312.

The previous prime is 28213307. The next prime is 28213327. The reversal of 28213313 is 31331282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21827584 + 6385729 = 4672^2 + 2527^2 .

It is a cyclic number.

It is not a de Polignac number, because 28213313 - 2¹² = 28209217 is a prime.

It is not a weakly prime, because it can be changed into another prime (28213343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14106656 + 14106657.

It is an arithmetic number, because the mean of its divisors is an integer number (14106657).

Almost surely, 2^28213313 is an apocalyptic number.

It is an amenable number.

28213313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28213313 is an equidigital number, since it uses as much as digits as its factorization.

28213313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 28213313 is about 5311.6205625026. The cubic root of 28213313 is about 304.4280709054.

Adding to 28213313 its reverse (31331282), we get a palindrome (59544595).

The spelling of 28213313 in words is "twenty-eight million, two hundred thirteen thousand, three hundred thirteen".