81948727 has 6 divisors (see below), whose sum is σ = 95328168. Its totient is φ = 70241724.

The previous prime is 81948677. The next prime is 81948731. The reversal of 81948727 is 72784918.

It is not a de Polignac number, because 81948727 - 2¹¹ = 81946679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81946727) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 836163 + ... + 836260.

It is an arithmetic number, because the mean of its divisors is an integer number (15888028).

Almost surely, 2^81948727 is an apocalyptic number.

81948727 is a deficient number, since it is larger than the sum of its proper divisors (13379441).

81948727 is a wasteful number, since it uses less digits than its factorization.

81948727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672437 (or 1672430 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The square root of 81948727 is about 9052.5536176264. The cubic root of 81948727 is about 434.3575790470.

The spelling of 81948727 in words is "eighty-one million, nine hundred forty-eight thousand, seven hundred twenty-seven".