81333342 has 64 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 25935840.

The previous prime is 81333337. The next prime is 81333349. The reversal of 81333342 is 24333318.

It is a super-2 number, since 2×81333342² = 13230225041777928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81333349) 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, 261367 + ... + 261677.

It is an arithmetic number, because the mean of its divisors is an integer number (2948400).

Almost surely, 2^81333342 is an apocalyptic number.

It is a pronic number, being equal to 9018×9019.

It is a practical number, because each smaller number is the sum of distinct divisors of 81333342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

81333342 is an abundant number, since it is smaller than the sum of its proper divisors (107364258).

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

81333342 is a wasteful number, since it uses less digits than its factorization.

81333342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 512 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 81333342 is about 9018.4999861396. The cubic root of 81333342 is about 433.2675925254.

The spelling of 81333342 in words is "eighty-one million, three hundred thirty-three thousand, three hundred forty-two".