81886912 has 14 divisors (see below), whose sum is σ = 162494468. Its totient is φ = 40943424.

The previous prime is 81886879. The next prime is 81886913. The reversal of 81886912 is 21968818.

It is not an unprimeable number, because it can be changed into a prime (81886913) 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 as a sum of consecutive naturals, namely, 639678 + ... + 639805.

Almost surely, 2^81886912 is an apocalyptic number.

It is an amenable number.

81886912 is a deficient number, since it is larger than the sum of its proper divisors (80607556).

81886912 is a wasteful number, since it uses less digits than its factorization.

81886912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279495 (or 1279485 counting only the distinct ones).

The product of its digits is 55296, while the sum is 43.

The square root of 81886912 is about 9049.1387435490. The cubic root of 81886912 is about 434.2483377014.

The spelling of 81886912 in words is "eighty-one million, eight hundred eighty-six thousand, nine hundred twelve".