28083565 has 8 divisors (see below), whose sum is σ = 34522488. Its totient is φ = 21918720.

The previous prime is 28083563. The next prime is 28083589. The reversal of 28083565 is 56538082.

It can be written as a sum of positive squares in 4 ways, for example, as 2490084 + 25593481 = 1578^2 + 5059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28083565 - 2¹ = 28083563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28083563) 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 7 ways as a sum of consecutive naturals, for example, 68292 + ... + 68701.

It is an arithmetic number, because the mean of its divisors is an integer number (4315311).

Almost surely, 2^28083565 is an apocalyptic number.

It is an amenable number.

28083565 is a deficient number, since it is larger than the sum of its proper divisors (6438923).

28083565 is a wasteful number, since it uses less digits than its factorization.

28083565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137039.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 28083565 is about 5299.3928897563. The cubic root of 28083565 is about 303.9606835407.

It can be divided in two parts, 280835 and 65, that added together give a square (280900 = 530²).

The spelling of 28083565 in words is "twenty-eight million, eighty-three thousand, five hundred sixty-five".