72111871 has 8 divisors (see below), whose sum is σ = 78001280. Its totient is φ = 66271392.

The previous prime is 72111847. The next prime is 72111883. The reversal of 72111871 is 17811127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72111871 - 2⁵ = 72111839 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 (72115871) 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, 9135 + ... + 15088.

It is an arithmetic number, because the mean of its divisors is an integer number (9750160).

Almost surely, 2^72111871 is an apocalyptic number.

72111871 is a deficient number, since it is larger than the sum of its proper divisors (5889409).

72111871 is a wasteful number, since it uses less digits than its factorization.

72111871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24465.

The product of its digits is 784, while the sum is 28.

The square root of 72111871 is about 8491.8708774922. The cubic root of 72111871 is about 416.2321170553.

Adding to 72111871 its reverse (17811127), we get a palindrome (89922998).

The spelling of 72111871 in words is "seventy-two million, one hundred eleven thousand, eight hundred seventy-one".