72716181 has 4 divisors (see below), whose sum is σ = 96954912. Its totient is φ = 48477452.

The previous prime is 72716177. The next prime is 72716213. The reversal of 72716181 is 18161727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18161727 = 3 ⋅6053909.

It is a cyclic number.

It is not a de Polignac number, because 72716181 - 2² = 72716177 is a prime.

It is a super-2 number, since 2×72716181² = 10575285958449522, 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 (72716381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12119361 + ... + 12119366.

It is an arithmetic number, because the mean of its divisors is an integer number (24238728).

Almost surely, 2^72716181 is an apocalyptic number.

It is an amenable number.

72716181 is a deficient number, since it is larger than the sum of its proper divisors (24238731).

72716181 is a wasteful number, since it uses less digits than its factorization.

72716181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24238730.

The product of its digits is 4704, while the sum is 33.

The square root of 72716181 is about 8527.3783192726. The cubic root of 72716181 is about 417.3915833563.

The spelling of 72716181 in words is "seventy-two million, seven hundred sixteen thousand, one hundred eighty-one".