71705 has 4 divisors (see below), whose sum is σ = 86052. Its totient is φ = 57360.

The previous prime is 71699. The next prime is 71707. The reversal of 71705 is 50717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50717 = 41 ⋅1237.

It can be written as a sum of positive squares in 2 ways, for example, as 10201 + 61504 = 101^2 + 248^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71705 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7166 + ... + 7175.

It is an arithmetic number, because the mean of its divisors is an integer number (21513).

2⁷¹⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

71705 is a deficient number, since it is larger than the sum of its proper divisors (14347).

71705 is a wasteful number, since it uses less digits than its factorization.

71705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14346.

The product of its (nonzero) digits is 245, while the sum is 20.

The square root of 71705 is about 267.7778930382. Note that the first 3 decimals coincide. The cubic root of 71705 is about 41.5447815821.

It can be divided in two parts, 7 and 1705, that multiplied together give a triangular number (11935 = T₁₅₄).

The spelling of 71705 in words is "seventy-one thousand, seven hundred five".