81073712 has 40 divisors (see below), whose sum is σ = 165108480. Its totient is φ = 38491200.

The previous prime is 81073709. The next prime is 81073717. The reversal of 81073712 is 21737018.

It is not an unprimeable number, because it can be changed into a prime (81073717) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54839 + ... + 56297.

It is an arithmetic number, because the mean of its divisors is an integer number (4127712).

Almost surely, 2^81073712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81073712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82554240).

81073712 is an abundant number, since it is smaller than the sum of its proper divisors (84034768).

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

81073712 is a wasteful number, since it uses less digits than its factorization.

81073712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641 (or 1635 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 81073712 is about 9004.0941798717. The cubic root of 81073712 is about 432.8060795713.

The spelling of 81073712 in words is "eighty-one million, seventy-three thousand, seven hundred twelve".