81896858 has 16 divisors (see below), whose sum is σ = 124027200. Its totient is φ = 40556736.

The previous prime is 81896827. The next prime is 81896869. The reversal of 81896858 is 85869818.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 137810 + ... + 138402.

It is an arithmetic number, because the mean of its divisors is an integer number (7751700).

Almost surely, 2^81896858 is an apocalyptic number.

81896858 is a deficient number, since it is larger than the sum of its proper divisors (42130342).

81896858 is a wasteful number, since it uses less digits than its factorization.

81896858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141.

The product of its digits is 1105920, while the sum is 53.

The square root of 81896858 is about 9049.6882819244. The cubic root of 81896858 is about 434.2659182850.

The spelling of 81896858 in words is "eighty-one million, eight hundred ninety-six thousand, eight hundred fifty-eight".