72316581 has 8 divisors (see below), whose sum is σ = 96462240. Its totient is φ = 48190992.

The previous prime is 72316571. The next prime is 72316619. The reversal of 72316581 is 18561327.

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

It is not a de Polignac number, because 72316581 - 2¹¹ = 72314533 is a prime.

It is a super-2 number, since 2×72316581² = 10459375775059122, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72316561) 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, 8946 + ... + 14988.

It is an arithmetic number, because the mean of its divisors is an integer number (12057780).

Almost surely, 2^72316581 is an apocalyptic number.

It is an amenable number.

72316581 is a deficient number, since it is larger than the sum of its proper divisors (24145659).

72316581 is a wasteful number, since it uses less digits than its factorization.

72316581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10035.

The product of its digits is 10080, while the sum is 33.

The square root of 72316581 is about 8503.9156275212. The cubic root of 72316581 is about 416.6256092522.

The spelling of 72316581 in words is "seventy-two million, three hundred sixteen thousand, five hundred eighty-one".