218268380 has 24 divisors (see below), whose sum is σ = 500033520. Its totient is φ = 79370240.

The previous prime is 218268361. The next prime is 218268383. The reversal of 218268380 is 83862812.

218268380 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218268383) 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 7 ways as a sum of consecutive naturals, for example, 495845 + ... + 496284.

It is an arithmetic number, because the mean of its divisors is an integer number (20834730).

Almost surely, 2^218268380 is an apocalyptic number.

218268380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218268380 is an abundant number, since it is smaller than the sum of its proper divisors (281765140).

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

218268380 is a wasteful number, since it uses less digits than its factorization.

218268380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992149 (or 992147 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 218268380 is about 14773.9087583483. The cubic root of 218268380 is about 602.0930419872.

The spelling of 218268380 in words is "two hundred eighteen million, two hundred sixty-eight thousand, three hundred eighty".