28443313 has 2 divisors, whose sum is σ = 28443314. Its totient is φ = 28443312.

The previous prime is 28443307. The next prime is 28443367. The reversal of 28443313 is 31334482.

28443313 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25321024 + 3122289 = 5032^2 + 1767^2 .

It is a cyclic number.

It is not a de Polignac number, because 28443313 - 2⁵ = 28443281 is a prime.

It is not a weakly prime, because it can be changed into another prime (28443013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14221656 + 14221657.

It is an arithmetic number, because the mean of its divisors is an integer number (14221657).

Almost surely, 2^28443313 is an apocalyptic number.

It is an amenable number.

28443313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28443313 is an equidigital number, since it uses as much as digits as its factorization.

28443313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

The square root of 28443313 is about 5333.2272593618. The cubic root of 28443313 is about 305.2530838546.

Adding to 28443313 its reverse (31334482), we get a palindrome (59777795).

The spelling of 28443313 in words is "twenty-eight million, four hundred forty-three thousand, three hundred thirteen".