81360860 has 24 divisors (see below), whose sum is σ = 195266400. Its totient is φ = 27895104.

The previous prime is 81360841. The next prime is 81360889. The reversal of 81360860 is 6806318.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290435 + ... + 290714.

It is an arithmetic number, because the mean of its divisors is an integer number (8136100).

Almost surely, 2^81360860 is an apocalyptic number.

It is an amenable number.

81360860 is an abundant number, since it is smaller than the sum of its proper divisors (113905540).

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

81360860 is a wasteful number, since it uses less digits than its factorization.

81360860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581165 (or 581163 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 81360860 is about 9020.0254988553. The cubic root of 81360860 is about 433.3164503613.

The spelling of 81360860 in words is "eighty-one million, three hundred sixty thousand, eight hundred sixty".