81716305 has 8 divisors (see below), whose sum is σ = 106974144. Its totient is φ = 59430000.

The previous prime is 81716269. The next prime is 81716317. The reversal of 81716305 is 50361718.

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

It is not a de Polignac number, because 81716305 - 2⁷ = 81716177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742821 + ... + 742930.

It is an arithmetic number, because the mean of its divisors is an integer number (13371768).

Almost surely, 2^81716305 is an apocalyptic number.

It is an amenable number.

81716305 is a deficient number, since it is larger than the sum of its proper divisors (25257839).

81716305 is a wasteful number, since it uses less digits than its factorization.

81716305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485767.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 81716305 is about 9039.7071302117. The cubic root of 81716305 is about 433.9465502922.

The spelling of 81716305 in words is "eighty-one million, seven hundred sixteen thousand, three hundred five".