81823884 has 24 divisors (see below), whose sum is σ = 193773888. Its totient is φ = 26867280.

The previous prime is 81823871. The next prime is 81823913. The reversal of 81823884 is 48832818.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50082 + ... + 51689.

It is an arithmetic number, because the mean of its divisors is an integer number (8073912).

Almost surely, 2^81823884 is an apocalyptic number.

It is an amenable number.

81823884 is an abundant number, since it is smaller than the sum of its proper divisors (111950004).

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

81823884 is a wasteful number, since it uses less digits than its factorization.

81823884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101845 (or 101843 counting only the distinct ones).

The product of its digits is 98304, while the sum is 42.

The square root of 81823884 is about 9045.6555318009. The cubic root of 81823884 is about 434.1368960855.

The spelling of 81823884 in words is "eighty-one million, eight hundred twenty-three thousand, eight hundred eighty-four".