81882438 has 128 divisors (see below), whose sum is σ = 209018880. Its totient is φ = 21035520.

The previous prime is 81882433. The next prime is 81882481. The reversal of 81882438 is 83428818.

It is a self number, because there is not a number n which added to its sum of digits gives 81882438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81882433) 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 63 ways as a sum of consecutive naturals, for example, 490231 + ... + 490397.

It is an arithmetic number, because the mean of its divisors is an integer number (1632960).

Almost surely, 2^81882438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81882438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104509440).

81882438 is an abundant number, since it is smaller than the sum of its proper divisors (127136442).

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

81882438 is a wasteful number, since it uses less digits than its factorization.

81882438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242.

The product of its digits is 98304, while the sum is 42.

The square root of 81882438 is about 9048.8915343262. The cubic root of 81882438 is about 434.2404289795.

The spelling of 81882438 in words is "eighty-one million, eight hundred eighty-two thousand, four hundred thirty-eight".