81727648 has 24 divisors (see below), whose sum is σ = 167898528. Its totient is φ = 39086784.

The previous prime is 81727631. The next prime is 81727651. The reversal of 81727648 is 84672718.

It is a super-2 number, since 2×81727648² = 13358816895223808, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54786 + ... + 56257.

It is an arithmetic number, because the mean of its divisors is an integer number (6995772).

Almost surely, 2^81727648 is an apocalyptic number.

It is an amenable number.

81727648 is an abundant number, since it is smaller than the sum of its proper divisors (86170880).

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

81727648 is a wasteful number, since it uses less digits than its factorization.

81727648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111076 (or 111068 counting only the distinct ones).

The product of its digits is 150528, while the sum is 43.

The square root of 81727648 is about 9040.3345070855. The cubic root of 81727648 is about 433.9666279988.

The spelling of 81727648 in words is "eighty-one million, seven hundred twenty-seven thousand, six hundred forty-eight".