28616565 has 64 divisors (see below), whose sum is σ = 51609600. Its totient is φ = 13478400.

The previous prime is 28616521. The next prime is 28616569. The reversal of 28616565 is 56561682.

It is not a de Polignac number, because 28616565 - 2⁶ = 28616501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28616569) 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, 362196 + ... + 362274.

It is an arithmetic number, because the mean of its divisors is an integer number (806400).

Almost surely, 2^28616565 is an apocalyptic number.

It is an amenable number.

28616565 is a deficient number, since it is larger than the sum of its proper divisors (22993035).

28616565 is a wasteful number, since it uses less digits than its factorization.

28616565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178.

The product of its digits is 86400, while the sum is 39.

The square root of 28616565 is about 5349.4452983464. The cubic root of 28616565 is about 305.8716087456.

The spelling of 28616565 in words is "twenty-eight million, six hundred sixteen thousand, five hundred sixty-five".