81548592 has 120 divisors (see below), whose sum is σ = 232391376. Its totient is φ = 24551424.

The previous prime is 81548591. The next prime is 81548603. The reversal of 81548592 is 29584518.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81548591) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1117068 + ... + 1117140.

Almost surely, 2^81548592 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 81548592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116195688).

81548592 is an abundant number, since it is smaller than the sum of its proper divisors (150842784).

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

81548592 is a wasteful number, since it uses less digits than its factorization.

81548592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 132 counting only the distinct ones).

The product of its digits is 115200, while the sum is 42.

The square root of 81548592 is about 9030.4259035773. The cubic root of 81548592 is about 433.6494723942.

The spelling of 81548592 in words is "eighty-one million, five hundred forty-eight thousand, five hundred ninety-two".