72115559 has 4 divisors (see below), whose sum is σ = 72372480. Its totient is φ = 71858640.

The previous prime is 72115529. The next prime is 72115591. The reversal of 72115559 is 95551127.

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

It is a cyclic number.

It is not a de Polignac number, because 72115559 - 2¹⁶ = 72050023 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 (72115529) 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, 128039 + ... + 128600.

It is an arithmetic number, because the mean of its divisors is an integer number (18093120).

Almost surely, 2^72115559 is an apocalyptic number.

72115559 is a deficient number, since it is larger than the sum of its proper divisors (256921).

72115559 is a wasteful number, since it uses less digits than its factorization.

72115559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256920.

The product of its digits is 15750, while the sum is 35.

The square root of 72115559 is about 8492.0880235664. The cubic root of 72115559 is about 416.2392126872.

The spelling of 72115559 in words is "seventy-two million, one hundred fifteen thousand, five hundred fifty-nine".