72109218 has 32 divisors (see below), whose sum is σ = 153397440. Its totient is φ = 22533120.

The previous prime is 72109217. The next prime is 72109231. The reversal of 72109218 is 81290127.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72109217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7798 + ... + 14318.

It is an arithmetic number, because the mean of its divisors is an integer number (4793670).

Almost surely, 2^72109218 is an apocalyptic number.

72109218 is an abundant number, since it is smaller than the sum of its proper divisors (81288222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72109218 is a wasteful number, since it uses less digits than its factorization.

72109218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6642.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 72109218 is about 8491.7146678395. The cubic root of 72109218 is about 416.2270125913.

It can be divided in two parts, 72109 and 218, that added together give a palindrome (72327).

The spelling of 72109218 in words is "seventy-two million, one hundred nine thousand, two hundred eighteen".