71686206 has 12 divisors (see below), whose sum is σ = 155320152. Its totient is φ = 23895396.

The previous prime is 71686189. The next prime is 71686211. The reversal of 71686206 is 60268617.

It is a happy number.

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1991266 + ... + 1991301.

It is an arithmetic number, because the mean of its divisors is an integer number (12943346).

Almost surely, 2^71686206 is an apocalyptic number.

71686206 is an abundant number, since it is smaller than the sum of its proper divisors (83633946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71686206 is a wasteful number, since it uses less digits than its factorization.

71686206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982575 (or 3982572 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 71686206 is about 8466.7706948990. The cubic root of 71686206 is about 415.4115161274.

The spelling of 71686206 in words is "seventy-one million, six hundred eighty-six thousand, two hundred six".