81333318 has 32 divisors (see below), whose sum is σ = 178008192. Its totient is φ = 24569600.

The previous prime is 81333311. The next prime is 81333337.

81333318 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81333311) 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 15 ways as a sum of consecutive naturals, for example, 21553 + ... + 25043.

It is an arithmetic number, because the mean of its divisors is an integer number (5562756).

Almost surely, 2^81333318 is an apocalyptic number.

81333318 is an abundant number, since it is smaller than the sum of its proper divisors (96674874).

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

81333318 is a wasteful number, since it uses less digits than its factorization.

81333318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860.

The product of its digits is 5184, while the sum is 30.

The square root of 81333318 is about 9018.4986555413. The cubic root of 81333318 is about 433.2675499089.

The spelling of 81333318 in words is "eighty-one million, three hundred thirty-three thousand, three hundred eighteen".