81016180 has 24 divisors (see below), whose sum is σ = 194439168. Its totient is φ = 27776928.

The previous prime is 81016147. The next prime is 81016211. The reversal of 81016180 is 8161018.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 289204 + ... + 289483.

It is an arithmetic number, because the mean of its divisors is an integer number (8101632).

Almost surely, 2^81016180 is an apocalyptic number.

It is an amenable number.

81016180 is an abundant number, since it is smaller than the sum of its proper divisors (113422988).

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

81016180 is a wasteful number, since it uses less digits than its factorization.

81016180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578703 (or 578701 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 81016180 is about 9000.8988440044. The cubic root of 81016180 is about 432.7036785545.

Adding to 81016180 its reverse (8161018), we get a palindrome (89177198).

The spelling of 81016180 in words is "eighty-one million, sixteen thousand, one hundred eighty".