81073805 has 8 divisors (see below), whose sum is σ = 97350144. Its totient is φ = 64818000.

The previous prime is 81073801. The next prime is 81073807. The reversal of 81073805 is 50837018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81073805 - 2² = 81073801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81073801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5600 + ... + 13910.

It is an arithmetic number, because the mean of its divisors is an integer number (12168768).

Almost surely, 2^81073805 is an apocalyptic number.

It is an amenable number.

81073805 is a deficient number, since it is larger than the sum of its proper divisors (16276339).

81073805 is a wasteful number, since it uses less digits than its factorization.

81073805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10267.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81073805 is about 9004.0993441876. The cubic root of 81073805 is about 432.8062450625.

The spelling of 81073805 in words is "eighty-one million, seventy-three thousand, eight hundred five".