81481296 has 40 divisors (see below), whose sum is σ = 226686880. Its totient is φ = 25070976.

The previous prime is 81481243. The next prime is 81481303. The reversal of 81481296 is 69218418.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 64666 + ... + 65913.

It is an arithmetic number, because the mean of its divisors is an integer number (5667172).

Almost surely, 2^81481296 is an apocalyptic number.

It is an amenable number.

81481296 is an abundant number, since it is smaller than the sum of its proper divisors (145205584).

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

81481296 is a wasteful number, since it uses less digits than its factorization.

81481296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130603 (or 130597 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 81481296 is about 9026.6990644421. The cubic root of 81481296 is about 433.5301533259.

The spelling of 81481296 in words is "eighty-one million, four hundred eighty-one thousand, two hundred ninety-six".