65686 has 4 divisors (see below), whose sum is σ = 98532. Its totient is φ = 32842.

The previous prime is 65677. The next prime is 65687. The reversal of 65686 is 68656.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65687) by changing a digit.

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 as a sum of consecutive naturals, namely, 16420 + ... + 16423.

It is an arithmetic number, because the mean of its divisors is an integer number (24633).

2⁶⁵⁶⁸⁶ is an apocalyptic number.

65686 is a deficient number, since it is larger than the sum of its proper divisors (32846).

65686 is a wasteful number, since it uses less digits than its factorization.

65686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32845.

The product of its digits is 8640, while the sum is 31.

The square root of 65686 is about 256.2928013035. The cubic root of 65686 is about 40.3482099498.

The spelling of 65686 in words is "sixty-five thousand, six hundred eighty-six".