81033508 has 12 divisors (see below), whose sum is σ = 147974400. Its totient is φ = 38755112.

The previous prime is 81033503. The next prime is 81033529. The reversal of 81033508 is 80533018.

It is not an unprimeable number, because it can be changed into a prime (81033503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440308 + ... + 440491.

It is an arithmetic number, because the mean of its divisors is an integer number (12331200).

Almost surely, 2^81033508 is an apocalyptic number.

It is an amenable number.

81033508 is a deficient number, since it is larger than the sum of its proper divisors (66940892).

81033508 is a wasteful number, since it uses less digits than its factorization.

81033508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880826 (or 880824 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81033508 is about 9001.8613630738. The cubic root of 81033508 is about 432.7345257048.

It can be divided in two parts, 8103 and 3508, that added together give a palindrome (11611).

The spelling of 81033508 in words is "eighty-one million, thirty-three thousand, five hundred eight".