81733512 has 32 divisors (see below), whose sum is σ = 233524800. Its totient is φ = 23352384.

The previous prime is 81733507. The next prime is 81733523. The reversal of 81733512 is 21533718.

It is a self number, because there is not a number n which added to its sum of digits gives 81733512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243087 + ... + 243422.

It is an arithmetic number, because the mean of its divisors is an integer number (7297650).

Almost surely, 2^81733512 is an apocalyptic number.

It is an amenable number.

81733512 is an abundant number, since it is smaller than the sum of its proper divisors (151791288).

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

81733512 is a wasteful number, since it uses less digits than its factorization.

81733512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486525 (or 486521 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 81733512 is about 9040.6588255503. The cubic root of 81733512 is about 433.9770068588.

The spelling of 81733512 in words is "eighty-one million, seven hundred thirty-three thousand, five hundred twelve".