81113448 has 64 divisors (see below), whose sum is σ = 219240000. Its totient is φ = 24860160.

The previous prime is 81113429. The next prime is 81113449. The reversal of 81113448 is 84431118.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (81113449) 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 15 ways as a sum of consecutive naturals, for example, 155428 + ... + 155948.

It is an arithmetic number, because the mean of its divisors is an integer number (3425625).

Almost surely, 2^81113448 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 81113448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109620000).

81113448 is an abundant number, since it is smaller than the sum of its proper divisors (138126552).

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

81113448 is a wasteful number, since it uses less digits than its factorization.

81113448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1038 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 81113448 is about 9006.3004613437. The cubic root of 81113448 is about 432.8767772653.

The spelling of 81113448 in words is "eighty-one million, one hundred thirteen thousand, four hundred forty-eight".