218307612 has 24 divisors (see below), whose sum is σ = 509677056. Its totient is φ = 72727408.

The previous prime is 218307581. The next prime is 218307623. The reversal of 218307612 is 216703812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 218307612.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 22363 + ... + 30605.

It is an arithmetic number, because the mean of its divisors is an integer number (21236544).

Almost surely, 2^218307612 is an apocalyptic number.

It is an amenable number.

218307612 is an abundant number, since it is smaller than the sum of its proper divisors (291369444).

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

218307612 is a wasteful number, since it uses less digits than its factorization.

218307612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10457 (or 10455 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 218307612 is about 14775.2364448086. The cubic root of 218307612 is about 602.1291136331.

The spelling of 218307612 in words is "two hundred eighteen million, three hundred seven thousand, six hundred twelve".