81098844 has 12 divisors (see below), whose sum is σ = 189230664. Its totient is φ = 27032944.

The previous prime is 81098837. The next prime is 81098867. The reversal of 81098844 is 44889018.

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

It is a junction number, because it is equal to n+sod(n) for n = 81098796 and 81098805.

It is a congruent 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, 3379107 + ... + 3379130.

It is an arithmetic number, because the mean of its divisors is an integer number (15769222).

Almost surely, 2^81098844 is an apocalyptic number.

It is an amenable number.

81098844 is an abundant number, since it is smaller than the sum of its proper divisors (108131820).

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

81098844 is a wasteful number, since it uses less digits than its factorization.

81098844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758244 (or 6758242 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 81098844 is about 9005.4896590913. The cubic root of 81098844 is about 432.8507967320.

The spelling of 81098844 in words is "eighty-one million, ninety-eight thousand, eight hundred forty-four".