81103232 has 96 divisors (see below), whose sum is σ = 191745720. Its totient is φ = 34062336.

The previous prime is 81103213. The next prime is 81103249. The reversal of 81103232 is 23230118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 420128 + ... + 420320.

Almost surely, 2^81103232 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 81103232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95872860).

81103232 is an abundant number, since it is smaller than the sum of its proper divisors (110642488).

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

81103232 is a wasteful number, since it uses less digits than its factorization.

81103232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 81103232 is about 9005.7332849691. The cubic root of 81103232 is about 432.8586033170.

The spelling of 81103232 in words is "eighty-one million, one hundred three thousand, two hundred thirty-two".