81344532 has 24 divisors (see below), whose sum is σ = 189952672. Its totient is φ = 27093600.

The previous prime is 81344521. The next prime is 81344551. The reversal of 81344532 is 23544318.

It is a self number, because there is not a number n which added to its sum of digits gives 81344532.

It is a congruent number.

It is an unprimeable number.

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, 23982 + ... + 27162.

Almost surely, 2^81344532 is an apocalyptic number.

It is an amenable number.

81344532 is an abundant number, since it is smaller than the sum of its proper divisors (108608140).

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

81344532 is a wasteful number, since it uses less digits than its factorization.

81344532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5319 (or 5317 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 81344532 is about 9019.1203562210. The cubic root of 81344532 is about 433.2874615480.

The spelling of 81344532 in words is "eighty-one million, three hundred forty-four thousand, five hundred thirty-two".