72558218 has 8 divisors (see below), whose sum is σ = 109558560. Its totient is φ = 36038700.

The previous prime is 72558217. The next prime is 72558223. The reversal of 72558218 is 81285527.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (72558217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119828 + ... + 120431.

It is an arithmetic number, because the mean of its divisors is an integer number (13694820).

Almost surely, 2^72558218 is an apocalyptic number.

72558218 is a deficient number, since it is larger than the sum of its proper divisors (37000342).

72558218 is a wasteful number, since it uses less digits than its factorization.

72558218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240412.

The product of its digits is 44800, while the sum is 38.

The square root of 72558218 is about 8518.1111756069. Note that the first 4 decimals coincide. The cubic root of 72558218 is about 417.0891278567.

The spelling of 72558218 in words is "seventy-two million, five hundred fifty-eight thousand, two hundred eighteen".