81033332 has 12 divisors (see below), whose sum is σ = 141935556. Its totient is φ = 40480320.

The previous prime is 81033307. The next prime is 81033353. The reversal of 81033332 is 23333018.

It can be written as a sum of positive squares in 2 ways, for example, as 65383396 + 15649936 = 8086^2 + 3956^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81033298 and 81033307.

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 3 ways as a sum of consecutive naturals, for example, 3719 + ... + 13262.

It is an arithmetic number, because the mean of its divisors is an integer number (11827963).

Almost surely, 2^81033332 is an apocalyptic number.

It is an amenable number.

81033332 is a deficient number, since it is larger than the sum of its proper divisors (60902224).

81033332 is a wasteful number, since it uses less digits than its factorization.

81033332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18178 (or 18176 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 81033332 is about 9001.8515873125. The cubic root of 81033332 is about 432.7342124133.

The spelling of 81033332 in words is "eighty-one million, thirty-three thousand, three hundred thirty-two".