81088198 has 24 divisors (see below), whose sum is σ = 131695632. Its totient is φ = 37425024.

The previous prime is 81088193. The next prime is 81088199. The reversal of 81088198 is 89188018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81088193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29311 + ... + 31957.

It is an arithmetic number, because the mean of its divisors is an integer number (5487318).

Almost surely, 2^81088198 is an apocalyptic number.

81088198 is a deficient number, since it is larger than the sum of its proper divisors (50607434).

81088198 is a wasteful number, since it uses less digits than its factorization.

81088198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736 (or 2719 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 43.

The square root of 81088198 is about 9004.8985557862. The cubic root of 81088198 is about 432.8318555199.

The spelling of 81088198 in words is "eighty-one million, eighty-eight thousand, one hundred ninety-eight".