81417612 has 24 divisors (see below), whose sum is σ = 195109936. Its totient is φ = 26405568.

The previous prime is 81417599. The next prime is 81417643. The reversal of 81417612 is 21671418.

It is a self number, because there is not a number n which added to its sum of digits gives 81417612.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 91243 + ... + 92130.

Almost surely, 2^81417612 is an apocalyptic number.

It is an amenable number.

81417612 is an abundant number, since it is smaller than the sum of its proper divisors (113692324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81417612 is a wasteful number, since it uses less digits than its factorization.

81417612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183417 (or 183415 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 81417612 is about 9023.1708395663. The cubic root of 81417612 is about 433.4171779904.

It can be divided in two parts, 8141 and 7612, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 81417612 in words is "eighty-one million, four hundred seventeen thousand, six hundred twelve".