81344868 has 96 divisors (see below), whose sum is σ = 216932352. Its totient is φ = 23500800.

The previous prime is 81344867. The next prime is 81344873. The reversal of 81344868 is 86844318.

It is not an unprimeable number, because it can be changed into a prime (81344867) 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 31 ways as a sum of consecutive naturals, for example, 421380 + ... + 421572.

It is an arithmetic number, because the mean of its divisors is an integer number (2259712).

Almost surely, 2^81344868 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 81344868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108466176).

81344868 is an abundant number, since it is smaller than the sum of its proper divisors (135587484).

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

81344868 is a wasteful number, since it uses less digits than its factorization.

81344868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 343 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 81344868 is about 9019.1389832955. The cubic root of 81344868 is about 433.2880581231.

The spelling of 81344868 in words is "eighty-one million, three hundred forty-four thousand, eight hundred sixty-eight".