81043312 has 20 divisors (see below), whose sum is σ = 179453296. Its totient is φ = 34732800.

The previous prime is 81043289. The next prime is 81043321. The reversal of 81043312 is 21334018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361689 + ... + 361912.

Almost surely, 2^81043312 is an apocalyptic number.

It is an amenable number.

81043312 is an abundant number, since it is smaller than the sum of its proper divisors (98409984).

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

81043312 is a wasteful number, since it uses less digits than its factorization.

81043312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723616 (or 723610 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 81043312 is about 9002.4059006468. The cubic root of 81043312 is about 432.7519767499.

The spelling of 81043312 in words is "eighty-one million, forty-three thousand, three hundred twelve".