81416812 has 6 divisors (see below), whose sum is σ = 142479428. Its totient is φ = 40708404.

The previous prime is 81416747. The next prime is 81416813. The reversal of 81416812 is 21861418.

It is not an unprimeable number, because it can be changed into a prime (81416813) 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, 10177098 + ... + 10177105.

Almost surely, 2^81416812 is an apocalyptic number.

It is an amenable number.

81416812 is a deficient number, since it is larger than the sum of its proper divisors (61062616).

81416812 is a wasteful number, since it uses less digits than its factorization.

81416812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20354207 (or 20354205 counting only the distinct ones).

The product of its digits is 3072, while the sum is 31.

The square root of 81416812 is about 9023.1265091430. The cubic root of 81416812 is about 433.4157584168.

It can be divided in two parts, 81416 and 812, that added together give a palindrome (82228).

The spelling of 81416812 in words is "eighty-one million, four hundred sixteen thousand, eight hundred twelve".