81885350 has 12 divisors (see below), whose sum is σ = 152306844. Its totient is φ = 32754120.

The previous prime is 81885347. The next prime is 81885389. The reversal of 81885350 is 5358818.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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 5 ways as a sum of consecutive naturals, for example, 818804 + ... + 818903.

It is an arithmetic number, because the mean of its divisors is an integer number (12692237).

Almost surely, 2^81885350 is an apocalyptic number.

81885350 is a deficient number, since it is larger than the sum of its proper divisors (70421494).

81885350 is a wasteful number, since it uses less digits than its factorization.

81885350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637719 (or 1637714 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 81885350 is about 9049.0524365814. The cubic root of 81885350 is about 434.2455765755.

It can be divided in two parts, 818 and 85350, that added together give a palindrome (86168).

The spelling of 81885350 in words is "eighty-one million, eight hundred eighty-five thousand, three hundred fifty".