81898592 has 24 divisors (see below), whose sum is σ = 161447832. Its totient is φ = 40896000.

The previous prime is 81898591. The next prime is 81898603. The reversal of 81898592 is 29589818.

It is a self number, because there is not a number n which added to its sum of digits gives 81898592.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81898591) by changing a digit.

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, 37367 + ... + 39497.

It is an arithmetic number, because the mean of its divisors is an integer number (6726993).

Almost surely, 2^81898592 is an apocalyptic number.

It is an amenable number.

81898592 is a deficient number, since it is larger than the sum of its proper divisors (79549240).

81898592 is a wasteful number, since it uses less digits than its factorization.

81898592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342 (or 3334 counting only the distinct ones).

The product of its digits is 414720, while the sum is 50.

The square root of 81898592 is about 9049.7840858222. The cubic root of 81898592 is about 434.2689831636.

The spelling of 81898592 in words is "eighty-one million, eight hundred ninety-eight thousand, five hundred ninety-two".