28318291 has 2 divisors, whose sum is σ = 28318292. Its totient is φ = 28318290.

The previous prime is 28318253. The next prime is 28318307. The reversal of 28318291 is 19281382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28318291 - 2⁷ = 28318163 is a prime.

It is not a weakly prime, because it can be changed into another prime (28318211) 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 as a sum of consecutive naturals, namely, 14159145 + 14159146.

It is an arithmetic number, because the mean of its divisors is an integer number (14159146).

Almost surely, 2^28318291 is an apocalyptic number.

28318291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28318291 is an equidigital number, since it uses as much as digits as its factorization.

28318291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 28318291 is about 5321.4933054548. The cubic root of 28318291 is about 304.8051824047.

The spelling of 28318291 in words is "twenty-eight million, three hundred eighteen thousand, two hundred ninety-one".