81073256 has 16 divisors (see below), whose sum is σ = 165831840. Its totient is φ = 36851440.

The previous prime is 81073249. The next prime is 81073271. The reversal of 81073256 is 65237018.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460556 + ... + 460731.

It is an arithmetic number, because the mean of its divisors is an integer number (10364490).

Almost surely, 2^81073256 is an apocalyptic number.

It is an amenable number.

81073256 is an abundant number, since it is smaller than the sum of its proper divisors (84758584).

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

81073256 is a wasteful number, since it uses less digits than its factorization.

81073256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921304 (or 921300 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 81073256 is about 9004.0688580219. The cubic root of 81073256 is about 432.8052681289.

The spelling of 81073256 in words is "eighty-one million, seventy-three thousand, two hundred fifty-six".