75865 has 4 divisors (see below), whose sum is σ = 91044. Its totient is φ = 60688.

The previous prime is 75853. The next prime is 75869. The reversal of 75865 is 56857.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51529 + 24336 = 227^2 + 156^2 .

It is a cyclic number.

It is not a de Polignac number, because 75865 - 2⁵ = 75833 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7582 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (22761).

2⁷⁵⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

75865 is a deficient number, since it is larger than the sum of its proper divisors (15179).

75865 is a wasteful number, since it uses less digits than its factorization.

75865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15178.

The product of its digits is 8400, while the sum is 31.

The square root of 75865 is about 275.4360179788. The cubic root of 75865 is about 42.3331404432. Note that the first 3 decimals are identical.

The spelling of 75865 in words is "seventy-five thousand, eight hundred sixty-five".