72108171 has 8 divisors (see below), whose sum is σ = 106826960. Its totient is φ = 48072096.

The previous prime is 72108131. The next prime is 72108191. The reversal of 72108171 is 17180127.

It is not a de Polignac number, because 72108171 - 2¹⁴ = 72091787 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2670673 = 72108171 / (7 + 2 + 1 + 0 + 8 + 1 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72108121) 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, 1335310 + ... + 1335363.

It is an arithmetic number, because the mean of its divisors is an integer number (13353370).

Almost surely, 2^72108171 is an apocalyptic number.

72108171 is a deficient number, since it is larger than the sum of its proper divisors (34718789).

72108171 is a wasteful number, since it uses less digits than its factorization.

72108171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670682 (or 2670676 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 72108171 is about 8491.6530192890. The cubic root of 72108171 is about 416.2249980925.

Adding to 72108171 its reverse (17180127), we get a palindrome (89288298).

The spelling of 72108171 in words is "seventy-two million, one hundred eight thousand, one hundred seventy-one".