28560305 has 4 divisors (see below), whose sum is σ = 34272372. Its totient is φ = 22848240.

The previous prime is 28560251. The next prime is 28560353. The reversal of 28560305 is 50306582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 12271009 = 4036^2 + 3503^2 .

It is not a de Polignac number, because 28560305 - 2⁶ = 28560241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2856026 + ... + 2856035.

It is an arithmetic number, because the mean of its divisors is an integer number (8568093).

Almost surely, 2^28560305 is an apocalyptic number.

It is an amenable number.

28560305 is a deficient number, since it is larger than the sum of its proper divisors (5712067).

28560305 is an equidigital number, since it uses as much as digits as its factorization.

28560305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5712066.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 28560305 is about 5344.1842221241. The cubic root of 28560305 is about 305.6710299759.

Adding to 28560305 its reverse (50306582), we get a palindrome (78866887).

The spelling of 28560305 in words is "twenty-eight million, five hundred sixty thousand, three hundred five".