81032032 has 36 divisors (see below), whose sum is σ = 165277476. Its totient is φ = 39105920.

The previous prime is 81031999. The next prime is 81032069. The reversal of 81032032 is 23023018.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25407 + ... + 28417.

It is an arithmetic number, because the mean of its divisors is an integer number (4591041).

Almost surely, 2^81032032 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 81032032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82638738).

81032032 is an abundant number, since it is smaller than the sum of its proper divisors (84245444).

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

81032032 is a wasteful number, since it uses less digits than its factorization.

81032032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079 (or 3042 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 81032032 is about 9001.7793796560. The cubic root of 81032032 is about 432.7318983142.

The spelling of 81032032 in words is "eighty-one million, thirty-two thousand, thirty-two".