71686427 has 4 divisors (see below), whose sum is σ = 73623936. Its totient is φ = 69748920.

The previous prime is 71686403. The next prime is 71686429. The reversal of 71686427 is 72468617.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71686427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71686429) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 968699 + ... + 968772.

It is an arithmetic number, because the mean of its divisors is an integer number (18405984).

Almost surely, 2^71686427 is an apocalyptic number.

71686427 is a deficient number, since it is larger than the sum of its proper divisors (1937509).

71686427 is a wasteful number, since it uses less digits than its factorization.

71686427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937508.

The product of its digits is 112896, while the sum is 41.

The square root of 71686427 is about 8466.7837459097. The cubic root of 71686427 is about 415.4119430150.

The spelling of 71686427 in words is "seventy-one million, six hundred eighty-six thousand, four hundred twenty-seven".