81844068 has 12 divisors (see below), whose sum is σ = 190969520. Its totient is φ = 27281352.

The previous prime is 81844013. The next prime is 81844099. The reversal of 81844068 is 86044818.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3410158 + ... + 3410181.

Almost surely, 2^81844068 is an apocalyptic number.

It is an amenable number.

81844068 is an abundant number, since it is smaller than the sum of its proper divisors (109125452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81844068 is a wasteful number, since it uses less digits than its factorization.

81844068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6820346 (or 6820344 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 81844068 is about 9046.7711367095. The cubic root of 81844068 is about 434.1725902222.

The spelling of 81844068 in words is "eighty-one million, eight hundred forty-four thousand, sixty-eight".