72218559 has 8 divisors (see below), whose sum is σ = 110047360. Its totient is φ = 41267736.

The previous prime is 72218539. The next prime is 72218569. The reversal of 72218559 is 95581227.

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

It is not a de Polignac number, because 72218559 - 2⁵ = 72218527 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 (72218539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1719469 + ... + 1719510.

It is an arithmetic number, because the mean of its divisors is an integer number (13755920).

Almost surely, 2^72218559 is an apocalyptic number.

72218559 is a deficient number, since it is larger than the sum of its proper divisors (37828801).

72218559 is a wasteful number, since it uses less digits than its factorization.

72218559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438989.

The product of its digits is 50400, while the sum is 39.

The square root of 72218559 is about 8498.1503281597. The cubic root of 72218559 is about 416.4372848025.

The spelling of 72218559 in words is "seventy-two million, two hundred eighteen thousand, five hundred fifty-nine".