81871376 has 20 divisors (see below), whose sum is σ = 159384144. Its totient is φ = 40740000.

The previous prime is 81871357. The next prime is 81871397. The reversal of 81871376 is 67317818.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8750 + ... + 15501.

Almost surely, 2^81871376 is an apocalyptic number.

It is an amenable number.

81871376 is a deficient number, since it is larger than the sum of its proper divisors (77512768).

81871376 is a wasteful number, since it uses less digits than its factorization.

81871376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24470 (or 24464 counting only the distinct ones).

The product of its digits is 56448, while the sum is 41.

The square root of 81871376 is about 9048.2802785944. The cubic root of 81871376 is about 434.2208733659.

The spelling of 81871376 in words is "eighty-one million, eight hundred seventy-one thousand, three hundred seventy-six".