28560397 has 4 divisors (see below), whose sum is σ = 28725660. Its totient is φ = 28395136.

The previous prime is 28560379. The next prime is 28560403. The reversal of 28560397 is 79306582.

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 12068676 + 16491721 = 3474^2 + 4061^2 .

It is a cyclic number.

It is not a de Polignac number, because 28560397 - 2¹⁹ = 28036109 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28560377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82372 + ... + 82717.

It is an arithmetic number, because the mean of its divisors is an integer number (7181415).

Almost surely, 2^28560397 is an apocalyptic number.

It is an amenable number.

28560397 is a deficient number, since it is larger than the sum of its proper divisors (165263).

28560397 is a wasteful number, since it uses less digits than its factorization.

28560397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165262.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28560397 is about 5344.1928296049. The cubic root of 28560397 is about 305.6713581902.

The spelling of 28560397 in words is "twenty-eight million, five hundred sixty thousand, three hundred ninety-seven".