70865 has 4 divisors (see below), whose sum is σ = 85044. Its totient is φ = 56688.

The previous prime is 70853. The next prime is 70867. The reversal of 70865 is 56807.

70865 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

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 44944 + 25921 = 212^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 70865 - 2⁴ = 70849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70867) 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, 7082 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (21261).

2⁷⁰⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

70865 is a deficient number, since it is larger than the sum of its proper divisors (14179).

70865 is a wasteful number, since it uses less digits than its factorization.

70865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14178.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 70865 is about 266.2048083713. The cubic root of 70865 is about 41.3819162232.

The spelling of 70865 in words is "seventy thousand, eight hundred sixty-five".