72212218 has 16 divisors (see below), whose sum is σ = 117212256. Its totient is φ = 33168240.

The previous prime is 72212213. The next prime is 72212279. The reversal of 72212218 is 81221227.

It is a junction number, because it is equal to n+sod(n) for n = 72212192 and 72212201.

It is not an unprimeable number, because it can be changed into a prime (72212213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1096 + ... + 12067.

It is an arithmetic number, because the mean of its divisors is an integer number (7325766).

Almost surely, 2^72212218 is an apocalyptic number.

72212218 is a deficient number, since it is larger than the sum of its proper divisors (45000038).

72212218 is a wasteful number, since it uses less digits than its factorization.

72212218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13389.

The product of its digits is 896, while the sum is 25.

The square root of 72212218 is about 8497.7772387843. Note that the first 3 decimals coincide. The cubic root of 72212218 is about 416.4250963099.

Subtracting 72212218 from its reverse (81221227), we obtain a palindrome (9009009).

The spelling of 72212218 in words is "seventy-two million, two hundred twelve thousand, two hundred eighteen".