81344806 has 12 divisors (see below), whose sum is σ = 126083196. Its totient is φ = 39359460.

The previous prime is 81344803. The next prime is 81344807. The reversal of 81344806 is 60844318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81344801) 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 5 ways as a sum of consecutive naturals, for example, 19240 + ... + 23083.

It is an arithmetic number, because the mean of its divisors is an integer number (10506933).

Almost surely, 2^81344806 is an apocalyptic number.

81344806 is a deficient number, since it is larger than the sum of its proper divisors (44738390).

81344806 is a wasteful number, since it uses less digits than its factorization.

81344806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42387 (or 42356 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 81344806 is about 9019.1355461596. The cubic root of 81344806 is about 433.2879480409.

The spelling of 81344806 in words is "eighty-one million, three hundred forty-four thousand, eight hundred six".