71686 has 8 divisors (see below), whose sum is σ = 109224. Its totient is φ = 35280.

The previous prime is 71671. The next prime is 71693. The reversal of 71686 is 68617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×71686³ = 1105157813330568, which contains 333 as substring.

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 3 ways as a sum of consecutive naturals, for example, 100 + ... + 391.

It is an arithmetic number, because the mean of its divisors is an integer number (13653).

2⁷¹⁶⁸⁶ is an apocalyptic number.

71686 is a deficient number, since it is larger than the sum of its proper divisors (37538).

71686 is a wasteful number, since it uses less digits than its factorization.

71686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566.

The product of its digits is 2016, while the sum is 28.

The square root of 71686 is about 267.7424135246. The cubic root of 71686 is about 41.5411118213.

It can be divided in two parts, 71 and 686, that added together give a palindrome (757).

The spelling of 71686 in words is "seventy-one thousand, six hundred eighty-six".