81834544 has 80 divisors (see below), whose sum is σ = 182559744. Its totient is φ = 35193600.

The previous prime is 81834517. The next prime is 81834551. The reversal of 81834544 is 44543818.

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, 289027 + ... + 289309.

Almost surely, 2^81834544 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 81834544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91279872).

81834544 is an abundant number, since it is smaller than the sum of its proper divisors (100725200).

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

81834544 is a wasteful number, since it uses less digits than its factorization.

81834544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 380 counting only the distinct ones).

The product of its digits is 61440, while the sum is 37.

The square root of 81834544 is about 9046.2447457495. The cubic root of 81834544 is about 434.1557483575.

The spelling of 81834544 in words is "eighty-one million, eight hundred thirty-four thousand, five hundred forty-four".