71685 has 24 divisors (see below), whose sum is σ = 131040. Its totient is φ = 37584.

The previous prime is 71671. The next prime is 71693. The reversal of 71685 is 58617.

It is not a de Polignac number, because 71685 - 2⁸ = 71429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1186 + ... + 1244.

It is an arithmetic number, because the mean of its divisors is an integer number (5460).

2⁷¹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

71685 is a deficient number, since it is larger than the sum of its proper divisors (59355).

71685 is an equidigital number, since it uses as much as digits as its factorization.

71685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 67 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 71685 is about 267.7405460516. The cubic root of 71685 is about 41.5409186581.

The spelling of 71685 in words is "seventy-one thousand, six hundred eighty-five".