81342344 has 32 divisors (see below), whose sum is σ = 161032800. Its totient is φ = 38413440.

The previous prime is 81342337. The next prime is 81342377. The reversal of 81342344 is 44324318.

It is an unprimeable number.

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, 68879 + ... + 70049.

It is an arithmetic number, because the mean of its divisors is an integer number (5032275).

Almost surely, 2^81342344 is an apocalyptic number.

It is an amenable number.

81342344 is a deficient number, since it is larger than the sum of its proper divisors (79690456).

81342344 is a wasteful number, since it uses less digits than its factorization.

81342344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653 (or 1649 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 81342344 is about 9018.9990575451. Note that the first 3 decimals coincide. The cubic root of 81342344 is about 433.2835766670.

The spelling of 81342344 in words is "eighty-one million, three hundred forty-two thousand, three hundred forty-four".