81229548 has 48 divisors (see below), whose sum is σ = 199019520. Its totient is φ = 25752000.

The previous prime is 81229531. The next prime is 81229571. The reversal of 81229548 is 84592218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20098 + ... + 23798.

It is an arithmetic number, because the mean of its divisors is an integer number (4146240).

Almost surely, 2^81229548 is an apocalyptic number.

It is an amenable number.

81229548 is an abundant number, since it is smaller than the sum of its proper divisors (117789972).

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

81229548 is a wasteful number, since it uses less digits than its factorization.

81229548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3798 (or 3796 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 81229548 is about 9012.7436444182. The cubic root of 81229548 is about 433.0832084471.

The spelling of 81229548 in words is "eighty-one million, two hundred twenty-nine thousand, five hundred forty-eight".