28260305 has 16 divisors (see below), whose sum is σ = 34634304. Its totient is φ = 22132800.

The previous prime is 28260269. The next prime is 28260311. The reversal of 28260305 is 50306282.

It is not a de Polignac number, because 28260305 - 2¹⁰ = 28259281 is a prime.

It is a Duffinian 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, 53774 + ... + 54296.

It is an arithmetic number, because the mean of its divisors is an integer number (2164644).

Almost surely, 2^28260305 is an apocalyptic number.

It is an amenable number.

28260305 is a deficient number, since it is larger than the sum of its proper divisors (6373999).

28260305 is a wasteful number, since it uses less digits than its factorization.

28260305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 28260305 is about 5316.0422308330. The cubic root of 28260305 is about 304.5969952799.

Adding to 28260305 its reverse (50306282), we get a palindrome (78566587).

The spelling of 28260305 in words is "twenty-eight million, two hundred sixty thousand, three hundred five".