218806180 has 12 divisors (see below), whose sum is σ = 459493020. Its totient is φ = 87522464.

The previous prime is 218806157. The next prime is 218806193. The reversal of 218806180 is 81608812.

218806180 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 78004224 + 140801956 = 8832^2 + 11866^2 .

It is a super-2 number, since 2×218806180² = 95752288812384800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5470135 + ... + 5470174.

It is an arithmetic number, because the mean of its divisors is an integer number (38291085).

Almost surely, 2^218806180 is an apocalyptic number.

218806180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218806180 is an abundant number, since it is smaller than the sum of its proper divisors (240686840).

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

218806180 is a wasteful number, since it uses less digits than its factorization.

218806180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10940318 (or 10940316 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 218806180 is about 14792.0985664645. The cubic root of 218806180 is about 602.5871432639.

The spelling of 218806180 in words is "two hundred eighteen million, eight hundred six thousand, one hundred eighty".