72163571 has 4 divisors (see below), whose sum is σ = 74652000. Its totient is φ = 69675144.

The previous prime is 72163561. The next prime is 72163573. The reversal of 72163571 is 17536127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17536127 = 7 ⋅2505161.

It is a cyclic number.

It is not a de Polignac number, because 72163571 - 2¹⁰ = 72162547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72163573) 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, 1244171 + ... + 1244228.

It is an arithmetic number, because the mean of its divisors is an integer number (18663000).

Almost surely, 2^72163571 is an apocalyptic number.

72163571 is a deficient number, since it is larger than the sum of its proper divisors (2488429).

72163571 is a wasteful number, since it uses less digits than its factorization.

72163571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488428.

The product of its digits is 8820, while the sum is 32.

The square root of 72163571 is about 8494.9144198161. The cubic root of 72163571 is about 416.3315646660.

Adding to 72163571 its reverse (17536127), we get a palindrome (89699698).

The spelling of 72163571 in words is "seventy-two million, one hundred sixty-three thousand, five hundred seventy-one".