72172871 has 16 divisors (see below), whose sum is σ = 79418880. Its totient is φ = 65312640.

The previous prime is 72172853. The next prime is 72172897. The reversal of 72172871 is 17827127.

It is a de Polignac number, because none of the positive numbers 2^k-72172871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72172801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46376 + ... + 47906.

It is an arithmetic number, because the mean of its divisors is an integer number (4963680).

Almost surely, 2^72172871 is an apocalyptic number.

72172871 is a deficient number, since it is larger than the sum of its proper divisors (7246009).

72172871 is a wasteful number, since it uses less digits than its factorization.

72172871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654.

The product of its digits is 10976, while the sum is 35.

The square root of 72172871 is about 8495.4617885080. The cubic root of 72172871 is about 416.3494486536.

Adding to 72172871 its reverse (17827127), we get a palindrome (89999998).

The spelling of 72172871 in words is "seventy-two million, one hundred seventy-two thousand, eight hundred seventy-one".