86716581 has 8 divisors (see below), whose sum is σ = 132139584. Its totient is φ = 49552320.

The previous prime is 86716561. The next prime is 86716603. The reversal of 86716581 is 18561768.

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

It is not a de Polignac number, because 86716581 - 2⁷ = 86716453 is a prime.

It is a super-2 number, since 2×86716581² = 15039530840659122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86716501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2064660 + ... + 2064701.

It is an arithmetic number, because the mean of its divisors is an integer number (16517448).

Almost surely, 2^86716581 is an apocalyptic number.

It is an amenable number.

86716581 is a deficient number, since it is larger than the sum of its proper divisors (45423003).

86716581 is a wasteful number, since it uses less digits than its factorization.

86716581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129371.

The product of its digits is 80640, while the sum is 42.

The square root of 86716581 is about 9312.1738063677. The cubic root of 86716581 is about 442.6230727920.

The spelling of 86716581 in words is "eighty-six million, seven hundred sixteen thousand, five hundred eighty-one".