28760305 has 12 divisors (see below), whose sum is σ = 40147380. Its totient is φ = 19721184.

The previous prime is 28760213. The next prime is 28760323. The reversal of 28760305 is 50306782.

It can be written as a sum of positive squares in 2 ways, for example, as 12446784 + 16313521 = 3528^2 + 4039^2 .

It is not a de Polignac number, because 28760305 - 2⁷ = 28760177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58450 + ... + 58939.

It is an arithmetic number, because the mean of its divisors is an integer number (3345615).

Almost surely, 2^28760305 is an apocalyptic number.

It is an amenable number.

28760305 is a deficient number, since it is larger than the sum of its proper divisors (11387075).

28760305 is a wasteful number, since it uses less digits than its factorization.

28760305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117408 (or 117401 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 28760305 is about 5362.8635074930. The cubic root of 28760305 is about 306.3828811104.

The spelling of 28760305 in words is "twenty-eight million, seven hundred sixty thousand, three hundred five".