28363565 has 16 divisors (see below), whose sum is σ = 36369648. Its totient is φ = 21159936.

The previous prime is 28363547. The next prime is 28363567. The reversal of 28363565 is 56536382.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 178084 + 28185481 = 422^2 + 5309^2 .

It is a cyclic number.

It is not a de Polignac number, because 28363565 - 2¹⁶ = 28298029 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 (28363567) 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 15 ways as a sum of consecutive naturals, for example, 8129 + ... + 11081.

It is an arithmetic number, because the mean of its divisors is an integer number (2273103).

Almost surely, 2^28363565 is an apocalyptic number.

It is an amenable number.

28363565 is a deficient number, since it is larger than the sum of its proper divisors (8006083).

28363565 is a wasteful number, since it uses less digits than its factorization.

28363565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088.

The product of its digits is 129600, while the sum is 38.

The square root of 28363565 is about 5325.7454877228. The cubic root of 28363565 is about 304.9675321526.

The spelling of 28363565 in words is "twenty-eight million, three hundred sixty-three thousand, five hundred sixty-five".