81159648 has 96 divisors (see below), whose sum is σ = 222507936. Its totient is φ = 25878528.

The previous prime is 81159587. The next prime is 81159653. The reversal of 81159648 is 84695118.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 259140 + ... + 259452.

It is an arithmetic number, because the mean of its divisors is an integer number (2317791).

Almost surely, 2^81159648 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 81159648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111253968).

81159648 is an abundant number, since it is smaller than the sum of its proper divisors (141348288).

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

81159648 is a wasteful number, since it uses less digits than its factorization.

81159648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 428 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 81159648 is about 9008.8649673530. The cubic root of 81159648 is about 432.9589465884.

The spelling of 81159648 in words is "eighty-one million, one hundred fifty-nine thousand, six hundred forty-eight".