81098000 has 160 divisors (see below), whose sum is σ = 214486272. Its totient is φ = 29568000.

The previous prime is 81097999. The next prime is 81098047. The reversal of 81098000 is 89018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1885979 + ... + 1886021.

Almost surely, 2^81098000 is an apocalyptic number.

81098000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81098000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107243136).

81098000 is an abundant number, since it is smaller than the sum of its proper divisors (133388272).

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

81098000 is a wasteful number, since it uses less digits than its factorization.

81098000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 81098000 is about 9005.4427986635. The cubic root of 81098000 is about 432.8492951597.

The spelling of 81098000 in words is "eighty-one million, ninety-eight thousand".