72730171 has 4 divisors (see below), whose sum is σ = 73048000. Its totient is φ = 72412344.

The previous prime is 72730139. The next prime is 72730181. The reversal of 72730171 is 17103727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17103727 = 83 ⋅206069.

It is a cyclic number.

It is not a de Polignac number, because 72730171 - 2⁵ = 72730139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72730181) 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, 158571 + ... + 159028.

It is an arithmetic number, because the mean of its divisors is an integer number (18262000).

Almost surely, 2^72730171 is an apocalyptic number.

72730171 is a deficient number, since it is larger than the sum of its proper divisors (317829).

72730171 is a wasteful number, since it uses less digits than its factorization.

72730171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317828.

The product of its (nonzero) digits is 2058, while the sum is 28.

The square root of 72730171 is about 8528.1985788325. The cubic root of 72730171 is about 417.4183492183.

Adding to 72730171 its reverse (17103727), we get a palindrome (89833898).

The spelling of 72730171 in words is "seventy-two million, seven hundred thirty thousand, one hundred seventy-one".