72740171 has 4 divisors (see below), whose sum is σ = 83131632. Its totient is φ = 62348712.

The previous prime is 72740159. The next prime is 72740179. The reversal of 72740171 is 17104727.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72740171 is a prime.

It is a super-2 number, since 2×72740171² = 10582264954218482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72740179) 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, 5195720 + ... + 5195733.

It is an arithmetic number, because the mean of its divisors is an integer number (20782908).

Almost surely, 2^72740171 is an apocalyptic number.

72740171 is a deficient number, since it is larger than the sum of its proper divisors (10391461).

72740171 is a wasteful number, since it uses less digits than its factorization.

72740171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10391460.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 72740171 is about 8528.7848489688. The cubic root of 72740171 is about 417.4374792536.

Adding to 72740171 its reverse (17104727), we get a palindrome (89844898).

The spelling of 72740171 in words is "seventy-two million, seven hundred forty thousand, one hundred seventy-one".