71856538 has 16 divisors (see below), whose sum is σ = 116673480. Its totient is φ = 32993856.

The previous prime is 71856529. The next prime is 71856557. The reversal of 71856538 is 83565817.

It can be written as a sum of positive squares in 4 ways, for example, as 50168889 + 21687649 = 7083^2 + 4657^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71856494 and 71856503.

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 7 ways as a sum of consecutive naturals, for example, 1893 + ... + 12136.

Almost surely, 2^71856538 is an apocalyptic number.

71856538 is a deficient number, since it is larger than the sum of its proper divisors (44816942).

71856538 is a wasteful number, since it uses less digits than its factorization.

71856538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14241.

The product of its digits is 201600, while the sum is 43.

The square root of 71856538 is about 8476.8235796199. The cubic root of 71856538 is about 415.7402725698.

The spelling of 71856538 in words is "seventy-one million, eight hundred fifty-six thousand, five hundred thirty-eight".