81265338 has 96 divisors (see below), whose sum is σ = 232502400. Its totient is φ = 19860480.

The previous prime is 81265333. The next prime is 81265351. The reversal of 81265338 is 83356218.

It is not an unprimeable number, because it can be changed into a prime (81265333) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 21838 + ... + 25286.

It is an arithmetic number, because the mean of its divisors is an integer number (2421900).

Almost surely, 2^81265338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81265338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116251200).

81265338 is an abundant number, since it is smaller than the sum of its proper divisors (151237062).

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

81265338 is a wasteful number, since it uses less digits than its factorization.

81265338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492 (or 3489 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 81265338 is about 9014.7289476722. The cubic root of 81265338 is about 433.1468050590.

The spelling of 81265338 in words is "eighty-one million, two hundred sixty-five thousand, three hundred thirty-eight".