81448544 has 24 divisors (see below), whose sum is σ = 164688048. Its totient is φ = 39623040.

The previous prime is 81448541. The next prime is 81448561. The reversal of 81448544 is 44584418.

It is a junction number, because it is equal to n+sod(n) for n = 81448498 and 81448507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81448541) 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 3 ways as a sum of consecutive naturals, for example, 33212 + ... + 35579.

It is an arithmetic number, because the mean of its divisors is an integer number (6862002).

Almost surely, 2^81448544 is an apocalyptic number.

It is an amenable number.

81448544 is an abundant number, since it is smaller than the sum of its proper divisors (83239504).

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

81448544 is a wasteful number, since it uses less digits than its factorization.

81448544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68838 (or 68830 counting only the distinct ones).

The product of its digits is 81920, while the sum is 38.

The square root of 81448544 is about 9024.8847084049. The cubic root of 81448544 is about 433.4720586744.

The spelling of 81448544 in words is "eighty-one million, four hundred forty-eight thousand, five hundred forty-four".