81976328 has 16 divisors (see below), whose sum is σ = 175663680. Its totient is φ = 35132688.

The previous prime is 81976303. The next prime is 81976339. The reversal of 81976328 is 82367918.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 731876 + ... + 731987.

It is an arithmetic number, because the mean of its divisors is an integer number (10978980).

Almost surely, 2^81976328 is an apocalyptic number.

It is an amenable number.

81976328 is an abundant number, since it is smaller than the sum of its proper divisors (93687352).

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

81976328 is a wasteful number, since it uses less digits than its factorization.

81976328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463876 (or 1463872 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 81976328 is about 9054.0779762492. The cubic root of 81976328 is about 434.4063386323.

The spelling of 81976328 in words is "eighty-one million, nine hundred seventy-six thousand, three hundred twenty-eight".