81160128 has 84 divisors (see below), whose sum is σ = 265877040. Its totient is φ = 23187456.

The previous prime is 81160127. The next prime is 81160147. The reversal of 81160128 is 82106118.

It is a tau number, because it is divible by the number of its divisors (84).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81160127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6033 + ... + 14096.

Almost surely, 2^81160128 is an apocalyptic number.

It is an amenable number.

81160128 is an abundant number, since it is smaller than the sum of its proper divisors (184716912).

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

81160128 is a wasteful number, since it uses less digits than its factorization.

81160128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20154 (or 20141 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 81160128 is about 9008.8916077395. The cubic root of 81160128 is about 432.9598001320.

The spelling of 81160128 in words is "eighty-one million, one hundred sixty thousand, one hundred twenty-eight".