28274565 has 64 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 12499200.

The previous prime is 28274551. The next prime is 28274569. The reversal of 28274565 is 56547282.

It is not a de Polignac number, because 28274565 - 2⁷ = 28274437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28274569) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90760 + ... + 91070.

It is an arithmetic number, because the mean of its divisors is an integer number (842400).

Almost surely, 2^28274565 is an apocalyptic number.

It is an amenable number.

28274565 is a deficient number, since it is larger than the sum of its proper divisors (25639035).

28274565 is a wasteful number, since it uses less digits than its factorization.

28274565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 134400, while the sum is 39.

The square root of 28274565 is about 5317.3832850379. The cubic root of 28274565 is about 304.6482193411.

It can be divided in two parts, 282 and 74565, that added together give a palindrome (74847).

The spelling of 28274565 in words is "twenty-eight million, two hundred seventy-four thousand, five hundred sixty-five".