81132044 has 36 divisors (see below), whose sum is σ = 167053320. Its totient is φ = 34372800.

The previous prime is 81132031. The next prime is 81132047. The reversal of 81132044 is 44023118.

It is not an unprimeable number, because it can be changed into a prime (81132047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15119 + ... + 19769.

It is an arithmetic number, because the mean of its divisors is an integer number (4640370).

Almost surely, 2^81132044 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 81132044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83526660).

81132044 is an abundant number, since it is smaller than the sum of its proper divisors (85921276).

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

81132044 is a wasteful number, since it uses less digits than its factorization.

81132044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758 (or 4749 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 81132044 is about 9007.3327905657. The cubic root of 81132044 is about 432.9098550580.

The spelling of 81132044 in words is "eighty-one million, one hundred thirty-two thousand, forty-four".