81044880 has 160 divisors (see below), whose sum is σ = 302361600. Its totient is φ = 17542656.

The previous prime is 81044863. The next prime is 81044927. The reversal of 81044880 is 8844018.

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30651 + ... + 33189.

It is an arithmetic number, because the mean of its divisors is an integer number (1889760).

Almost surely, 2^81044880 is an apocalyptic number.

81044880 is a gapful number since it is divisible by the number (80) 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 81044880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151180800).

81044880 is an abundant number, since it is smaller than the sum of its proper divisors (221316720).

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

81044880 is a wasteful number, since it uses less digits than its factorization.

81044880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581 (or 2575 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 81044880 is about 9002.4929880561. The cubic root of 81044880 is about 432.7547676474.

Adding to 81044880 its reverse (8844018), we get a palindrome (89888898).

The spelling of 81044880 in words is "eighty-one million, forty-four thousand, eight hundred eighty".