28727565 has 16 divisors (see below), whose sum is σ = 46108608. Its totient is φ = 15273216.

The previous prime is 28727557. The next prime is 28727591. The reversal of 28727565 is 56572782.

It is not a de Polignac number, because 28727565 - 2³ = 28727557 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2214 + ... + 7896.

It is an arithmetic number, because the mean of its divisors is an integer number (2881788).

Almost surely, 2^28727565 is an apocalyptic number.

It is an amenable number.

28727565 is a deficient number, since it is larger than the sum of its proper divisors (17381043).

28727565 is a wasteful number, since it uses less digits than its factorization.

28727565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6028.

The product of its digits is 235200, while the sum is 42.

The square root of 28727565 is about 5359.8101645487. The cubic root of 28727565 is about 306.2665774728.

It can be divided in two parts, 28727 and 565, that added together give a palindrome (29292).

The spelling of 28727565 in words is "twenty-eight million, seven hundred twenty-seven thousand, five hundred sixty-five".