218218260 has 48 divisors (see below), whose sum is σ = 658014336. Its totient is φ = 53715072.

The previous prime is 218218241. The next prime is 218218271. The reversal of 218218260 is 62812812.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139104 + ... + 140663.

It is an arithmetic number, because the mean of its divisors is an integer number (13708632).

Almost surely, 2^218218260 is an apocalyptic number.

218218260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218218260 is an abundant number, since it is smaller than the sum of its proper divisors (439796076).

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

218218260 is a wasteful number, since it uses less digits than its factorization.

218218260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279792 (or 279790 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 218218260 is about 14772.2124273922. The cubic root of 218218260 is about 602.0469531411.

The spelling of 218218260 in words is "two hundred eighteen million, two hundred eighteen thousand, two hundred sixty".