28280311 has 2 divisors, whose sum is σ = 28280312. Its totient is φ = 28280310.

The previous prime is 28280297. The next prime is 28280327. The reversal of 28280311 is 11308282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28280311 - 2⁹ = 28279799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28281311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140155 + 14140156.

It is an arithmetic number, because the mean of its divisors is an integer number (14140156).

Almost surely, 2^28280311 is an apocalyptic number.

28280311 is a deficient number, since it is larger than the sum of its proper divisors (1).

28280311 is an equidigital number, since it uses as much as digits as its factorization.

28280311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28280311 is about 5317.9235609399. The cubic root of 28280311 is about 304.6688549678.

Adding to 28280311 its reverse (11308282), we get a palindrome (39588593).

The spelling of 28280311 in words is "twenty-eight million, two hundred eighty thousand, three hundred eleven".