71856818 has 12 divisors (see below), whose sum is σ = 118475070. Its totient is φ = 32662080.

The previous prime is 71856797. The next prime is 71856821. The reversal of 71856818 is 81865817.

It can be written as a sum of positive squares in only one way, i.e., 45468049 + 26388769 = 6743^2 + 5137^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148223 + ... + 148706.

Almost surely, 2^71856818 is an apocalyptic number.

71856818 is a deficient number, since it is larger than the sum of its proper divisors (46618252).

71856818 is a wasteful number, since it uses less digits than its factorization.

71856818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296953 (or 296942 counting only the distinct ones).

The product of its digits is 107520, while the sum is 44.

The square root of 71856818 is about 8476.8400952242. The cubic root of 71856818 is about 415.7408125676.

The spelling of 71856818 in words is "seventy-one million, eight hundred fifty-six thousand, eight hundred eighteen".