81282912 has 48 divisors (see below), whose sum is σ = 224602560. Its totient is φ = 25667712.

The previous prime is 81282907. The next prime is 81282913. The reversal of 81282912 is 21928218.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81282913) by changing a digit.

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, 20458 + ... + 24105.

It is an arithmetic number, because the mean of its divisors is an integer number (4679220).

Almost surely, 2^81282912 is an apocalyptic number.

It is an amenable number.

81282912 is an abundant number, since it is smaller than the sum of its proper divisors (143319648).

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

81282912 is a wasteful number, since it uses less digits than its factorization.

81282912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44595 (or 44587 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 81282912 is about 9015.7036331060. The cubic root of 81282912 is about 433.1780261327.

The spelling of 81282912 in words is "eighty-one million, two hundred eighty-two thousand, nine hundred twelve".