81839876 has 12 divisors (see below), whose sum is σ = 147840000. Its totient is φ = 39599880.

The previous prime is 81839869. The next prime is 81839917. The reversal of 81839876 is 67893818.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329876 + ... + 330123.

It is an arithmetic number, because the mean of its divisors is an integer number (12320000).

Almost surely, 2^81839876 is an apocalyptic number.

It is an amenable number.

81839876 is a deficient number, since it is larger than the sum of its proper divisors (66000124).

81839876 is a wasteful number, since it uses less digits than its factorization.

81839876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660034 (or 660032 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 81839876 is about 9046.5394488721. The cubic root of 81839876 is about 434.1651774163.

The spelling of 81839876 in words is "eighty-one million, eight hundred thirty-nine thousand, eight hundred seventy-six".