81333468 has 36 divisors (see below), whose sum is σ = 210378168. Its totient is φ = 26480160.

The previous prime is 81333431. The next prime is 81333493. The reversal of 81333468 is 86433318.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 24723 + ... + 27818.

It is an arithmetic number, because the mean of its divisors is an integer number (5843838).

Almost surely, 2^81333468 is an apocalyptic number.

It is an amenable number.

81333468 is an abundant number, since it is smaller than the sum of its proper divisors (129044700).

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

81333468 is a wasteful number, since it uses less digits than its factorization.

81333468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52594 (or 52589 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 81333468 is about 9018.5069717775. The cubic root of 81333468 is about 433.2678162618.

The spelling of 81333468 in words is "eighty-one million, three hundred thirty-three thousand, four hundred sixty-eight".