81360432 has 120 divisors (see below), whose sum is σ = 242573760. Its totient is φ = 25384320.

The previous prime is 81360401. The next prime is 81360439. The reversal of 81360432 is 23406318.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81360396 and 81360405.

It is not an unprimeable number, because it can be changed into a prime (81360439) 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 in 23 ways as a sum of consecutive naturals, for example, 358303 + ... + 358529.

It is an arithmetic number, because the mean of its divisors is an integer number (2021448).

Almost surely, 2^81360432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81360432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121286880).

81360432 is an abundant number, since it is smaller than the sum of its proper divisors (161213328).

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

81360432 is a wasteful number, since it uses less digits than its factorization.

81360432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 81360432 is about 9020.0017738357. The cubic root of 81360432 is about 433.3156905375.

The spelling of 81360432 in words is "eighty-one million, three hundred sixty thousand, four hundred thirty-two".