81716727 has 8 divisors (see below), whose sum is σ = 111489664. Its totient is φ = 53210808.

The previous prime is 81716699. The next prime is 81716749. The reversal of 81716727 is 72761718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81716727 - 2¹⁰ = 81715703 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 (81716227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316603 + ... + 316860.

It is an arithmetic number, because the mean of its divisors is an integer number (13936208).

Almost surely, 2^81716727 is an apocalyptic number.

81716727 is a deficient number, since it is larger than the sum of its proper divisors (29772937).

81716727 is a wasteful number, since it uses less digits than its factorization.

81716727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633509.

The product of its digits is 32928, while the sum is 39.

The square root of 81716727 is about 9039.7304716457. The cubic root of 81716727 is about 433.9472972877.

The spelling of 81716727 in words is "eighty-one million, seven hundred sixteen thousand, seven hundred twenty-seven".