81463164 has 24 divisors (see below), whose sum is σ = 196213248. Its totient is φ = 26278320.

The previous prime is 81463163. The next prime is 81463181. The reversal of 81463164 is 46136418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81463163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109122 + ... + 109865.

It is an arithmetic number, because the mean of its divisors is an integer number (8175552).

Almost surely, 2^81463164 is an apocalyptic number.

It is an amenable number.

81463164 is an abundant number, since it is smaller than the sum of its proper divisors (114750084).

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

81463164 is a wasteful number, since it uses less digits than its factorization.

81463164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219025 (or 219023 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 81463164 is about 9025.6946547066. The cubic root of 81463164 is about 433.4979931767.

The spelling of 81463164 in words is "eighty-one million, four hundred sixty-three thousand, one hundred sixty-four".