28816305 has 16 divisors (see below), whose sum is σ = 52692864. Its totient is φ = 13173120.

The previous prime is 28816289. The next prime is 28816349. The reversal of 28816305 is 50361882.

It is a happy number.

It is not a de Polignac number, because 28816305 - 2⁴ = 28816289 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137116 + ... + 137325.

It is an arithmetic number, because the mean of its divisors is an integer number (3293304).

Almost surely, 2^28816305 is an apocalyptic number.

It is an amenable number.

28816305 is a deficient number, since it is larger than the sum of its proper divisors (23876559).

28816305 is a wasteful number, since it uses less digits than its factorization.

28816305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274456.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28816305 is about 5368.0820597305. The cubic root of 28816305 is about 306.5816077634.

The spelling of 28816305 in words is "twenty-eight million, eight hundred sixteen thousand, three hundred five".