73565 has 4 divisors (see below), whose sum is σ = 88284. Its totient is φ = 58848.

The previous prime is 73561. The next prime is 73571. The reversal of 73565 is 56537.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56537 = 13 ⋅4349.

It can be written as a sum of positive squares in 2 ways, for example, as 40804 + 32761 = 202^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 73565 - 2² = 73561 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 (73561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7352 + ... + 7361.

It is an arithmetic number, because the mean of its divisors is an integer number (22071).

2⁷³⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

73565 is a deficient number, since it is larger than the sum of its proper divisors (14719).

73565 is a wasteful number, since it uses less digits than its factorization.

73565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14718.

The product of its digits is 3150, while the sum is 26.

The square root of 73565 is about 271.2286857985. The cubic root of 73565 is about 41.9009381145.

The spelling of 73565 in words is "seventy-three thousand, five hundred sixty-five".