81864110 has 8 divisors (see below), whose sum is σ = 147355416. Its totient is φ = 32745640.

The previous prime is 81864109. The next prime is 81864113. The reversal of 81864110 is 1146818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81864113) by changing a digit.

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, 4093196 + ... + 4093215.

It is an arithmetic number, because the mean of its divisors is an integer number (18419427).

Almost surely, 2^81864110 is an apocalyptic number.

81864110 is a deficient number, since it is larger than the sum of its proper divisors (65491306).

81864110 is a wasteful number, since it uses less digits than its factorization.

81864110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8186418.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 81864110 is about 9047.8787569242. The cubic root of 81864110 is about 434.2080274346.

The spelling of 81864110 in words is "eighty-one million, eight hundred sixty-four thousand, one hundred ten".