72238536257 has 4 divisors (see below), whose sum is σ = 72239626800. Its totient is φ = 72237445716.

The previous prime is 72238536247. The next prime is 72238536263. The reversal of 72238536257 is 75263583227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72238536257 - 2⁸ = 72238536001 is a prime.

It is a super-2 number, since 2×72238536257² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72238536247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439007 + ... + 580692.

It is an arithmetic number, because the mean of its divisors is an integer number (18059906700).

Almost surely, 2^72238536257 is an apocalyptic number.

It is an amenable number.

72238536257 is a deficient number, since it is larger than the sum of its proper divisors (1090543).

72238536257 is a wasteful number, since it uses less digits than its factorization.

72238536257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090542.

The product of its digits is 4233600, while the sum is 50.

The spelling of 72238536257 in words is "seventy-two billion, two hundred thirty-eight million, five hundred thirty-six thousand, two hundred fifty-seven".