81928888 has 16 divisors (see below), whose sum is σ = 155781360. Its totient is φ = 40387200.

The previous prime is 81928879. The next prime is 81928901. The reversal of 81928888 is 88882918.

81928888 is a modest number, since divided by 8888 gives 8192 as remainder.

It is a congruent number.

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, 71553 + ... + 72688.

It is an arithmetic number, because the mean of its divisors is an integer number (9736335).

Almost surely, 2^81928888 is an apocalyptic number.

It is an amenable number.

81928888 is a deficient number, since it is larger than the sum of its proper divisors (73852472).

81928888 is a wasteful number, since it uses less digits than its factorization.

81928888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144318 (or 144314 counting only the distinct ones).

The product of its digits is 589824, while the sum is 52.

The square root of 81928888 is about 9051.4577831419. The cubic root of 81928888 is about 434.3225249516.

The spelling of 81928888 in words is "eighty-one million, nine hundred twenty-eight thousand, eight hundred eighty-eight".