81345432 has 64 divisors (see below), whose sum is σ = 233153280. Its totient is φ = 23167872.

The previous prime is 81345427. The next prime is 81345449. The reversal of 81345432 is 23454318.

It is a self number, because there is not a number n which added to its sum of digits gives 81345432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73878 + ... + 74970.

It is an arithmetic number, because the mean of its divisors is an integer number (3643020).

Almost surely, 2^81345432 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 81345432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116576640).

81345432 is an abundant number, since it is smaller than the sum of its proper divisors (151807848).

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

81345432 is a wasteful number, since it uses less digits than its factorization.

81345432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552 (or 1548 counting only the distinct ones).

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

The square root of 81345432 is about 9019.1702500840. The cubic root of 81345432 is about 433.2890595135.

The spelling of 81345432 in words is "eighty-one million, three hundred forty-five thousand, four hundred thirty-two".