81471364 has 24 divisors (see below), whose sum is σ = 155711808. Its totient is φ = 37070880.

The previous prime is 81471349. The next prime is 81471391. The reversal of 81471364 is 46317418.

It is a happy 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, 7342 + ... + 14725.

It is an arithmetic number, because the mean of its divisors is an integer number (6487992).

Almost surely, 2^81471364 is an apocalyptic number.

It is an amenable number.

81471364 is a deficient number, since it is larger than the sum of its proper divisors (74240444).

81471364 is a wasteful number, since it uses less digits than its factorization.

81471364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22155 (or 22153 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 81471364 is about 9026.1489019404. The cubic root of 81471364 is about 433.5125378458.

The spelling of 81471364 in words is "eighty-one million, four hundred seventy-one thousand, three hundred sixty-four".