81342328 has 16 divisors (see below), whose sum is σ = 153490680. Its totient is φ = 40411488.

The previous prime is 81342307. The next prime is 81342337. The reversal of 81342328 is 82324318.

It is a self number, because there is not a number n which added to its sum of digits gives 81342328.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31126 + ... + 33637.

Almost surely, 2^81342328 is an apocalyptic number.

It is an amenable number.

81342328 is a deficient number, since it is larger than the sum of its proper divisors (72148352).

81342328 is a wasteful number, since it uses less digits than its factorization.

81342328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64926 (or 64922 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 81342328 is about 9018.9981705287. The cubic root of 81342328 is about 433.2835482581.

The spelling of 81342328 in words is "eighty-one million, three hundred forty-two thousand, three hundred twenty-eight".