81333372 has 24 divisors (see below), whose sum is σ = 200941776. Its totient is φ = 25516288.

The previous prime is 81333361. The next prime is 81333391. The reversal of 81333372 is 27333318.

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 7 ways as a sum of consecutive naturals, for example, 199143 + ... + 199550.

It is an arithmetic number, because the mean of its divisors is an integer number (8372574).

Almost surely, 2^81333372 is an apocalyptic number.

It is an amenable number.

81333372 is an abundant number, since it is smaller than the sum of its proper divisors (119608404).

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

81333372 is a wasteful number, since it uses less digits than its factorization.

81333372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398717 (or 398715 counting only the distinct ones).

The product of its digits is 9072, while the sum is 30.

The square root of 81333372 is about 9018.5016493872. The cubic root of 81333372 is about 433.2676457959.

The spelling of 81333372 in words is "eighty-one million, three hundred thirty-three thousand, three hundred seventy-two".