81080288 has 48 divisors (see below), whose sum is σ = 169238160. Its totient is φ = 38169600.

The previous prime is 81080273. The next prime is 81080291. The reversal of 81080288 is 88208018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36983 + ... + 39113.

It is an arithmetic number, because the mean of its divisors is an integer number (3525795).

Almost surely, 2^81080288 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 81080288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84619080).

81080288 is an abundant number, since it is smaller than the sum of its proper divisors (88157872).

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

81080288 is a wasteful number, since it uses less digits than its factorization.

81080288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211 (or 2203 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 35.

The square root of 81080288 is about 9004.4593396828. The cubic root of 81080288 is about 432.8177810865.

The spelling of 81080288 in words is "eighty-one million, eighty thousand, two hundred eighty-eight".