72157183 has 4 divisors (see below), whose sum is σ = 82465360. Its totient is φ = 61849008.

The previous prime is 72157159. The next prime is 72157199. The reversal of 72157183 is 38175127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72157183 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 (72154183) 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, 5154078 + ... + 5154091.

It is an arithmetic number, because the mean of its divisors is an integer number (20616340).

Almost surely, 2^72157183 is an apocalyptic number.

72157183 is a deficient number, since it is larger than the sum of its proper divisors (10308177).

72157183 is a wasteful number, since it uses less digits than its factorization.

72157183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10308176.

The product of its digits is 11760, while the sum is 34.

The square root of 72157183 is about 8494.5384218332. The cubic root of 72157183 is about 416.3192795916.

The spelling of 72157183 in words is "seventy-two million, one hundred fifty-seven thousand, one hundred eighty-three".