81098764 has 18 divisors (see below), whose sum is σ = 149537220. Its totient is φ = 38378016.

The previous prime is 81098749. The next prime is 81098803. The reversal of 81098764 is 46789018.

It is a self number, because there is not a number n which added to its sum of digits gives 81098764.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77992 + ... + 79024.

Almost surely, 2^81098764 is an apocalyptic number.

It is an amenable number.

81098764 is a deficient number, since it is larger than the sum of its proper divisors (68438456).

81098764 is a wasteful number, since it uses less digits than its factorization.

81098764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 81098764 is about 9005.4852173550. The cubic root of 81098764 is about 432.8506544034.

The spelling of 81098764 in words is "eighty-one million, ninety-eight thousand, seven hundred sixty-four".