81548544 has 216 divisors, whose sum is σ = 276823008. Its totient is φ = 21073920.

The previous prime is 81548543. The next prime is 81548573. The reversal of 81548544 is 44584518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81548543) 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, 413854 + ... + 414050.

It is an arithmetic number, because the mean of its divisors is an integer number (1281588).

Almost surely, 2^81548544 is an apocalyptic number.

81548544 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81548544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138411504).

81548544 is an abundant number, since it is smaller than the sum of its proper divisors (195274464).

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

81548544 is a wasteful number, since it uses less digits than its factorization.

81548544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 220 counting only the distinct ones).

The product of its digits is 102400, while the sum is 39.

The square root of 81548544 is about 9030.4232458950. The cubic root of 81548544 is about 433.6493873113.

The spelling of 81548544 in words is "eighty-one million, five hundred forty-eight thousand, five hundred forty-four".