81888446 has 8 divisors (see below), whose sum is σ = 122913840. Its totient is φ = 40917168.

The previous prime is 81888427. The next prime is 81888451. The reversal of 81888446 is 64488818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81888446.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 9506 + ... + 15941.

It is an arithmetic number, because the mean of its divisors is an integer number (15364230).

Almost surely, 2^81888446 is an apocalyptic number.

81888446 is a deficient number, since it is larger than the sum of its proper divisors (41025394).

81888446 is a wasteful number, since it uses less digits than its factorization.

81888446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27058.

The product of its digits is 393216, while the sum is 47.

The square root of 81888446 is about 9049.2235025995. The cubic root of 81888446 is about 434.2510492979.

The spelling of 81888446 in words is "eighty-one million, eight hundred eighty-eight thousand, four hundred forty-six".