71172172 has 12 divisors (see below), whose sum is σ = 126662760. Its totient is φ = 34982816.

The previous prime is 71172161. The next prime is 71172173. The reversal of 71172172 is 27127117.

It is a self number, because there is not a number n which added to its sum of digits gives 71172172.

It is not an unprimeable number, because it can be changed into a prime (71172173) 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, 150553 + ... + 151024.

It is an arithmetic number, because the mean of its divisors is an integer number (10555230).

Almost surely, 2^71172172 is an apocalyptic number.

It is an amenable number.

71172172 is a deficient number, since it is larger than the sum of its proper divisors (55490588).

71172172 is a wasteful number, since it uses less digits than its factorization.

71172172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301640 (or 301638 counting only the distinct ones).

The product of its digits is 1372, while the sum is 28.

The square root of 71172172 is about 8436.3601155949. The cubic root of 71172172 is about 414.4162150227.

Adding to 71172172 its reverse (27127117), we get a palindrome (98299289).

The spelling of 71172172 in words is "seventy-one million, one hundred seventy-two thousand, one hundred seventy-two".