28361565 has 48 divisors (see below), whose sum is σ = 51592320. Its totient is φ = 14394240.

The previous prime is 28361563. The next prime is 28361587. The reversal of 28361565 is 56516382.

It is not a de Polignac number, because 28361565 - 2¹ = 28361563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28361563) 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 47 ways as a sum of consecutive naturals, for example, 134310 + ... + 134520.

It is an arithmetic number, because the mean of its divisors is an integer number (1074840).

Almost surely, 2^28361565 is an apocalyptic number.

It is an amenable number.

28361565 is a deficient number, since it is larger than the sum of its proper divisors (23230755).

28361565 is a wasteful number, since it uses less digits than its factorization.

28361565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 351 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 28361565 is about 5325.5577172724. The cubic root of 28361565 is about 304.9603639258.

The spelling of 28361565 in words is "twenty-eight million, three hundred sixty-one thousand, five hundred sixty-five".