218643030 has 64 divisors (see below), whose sum is σ = 591088320. Its totient is φ = 57500928.

The previous prime is 218642993. The next prime is 218643041. The reversal of 218643030 is 30346812.

It is a happy number.

218643030 is a `hidden beast` number, since 2 + 18 + 643 + 0 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 218642985 and 218643003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14164 + ... + 25256.

It is an arithmetic number, because the mean of its divisors is an integer number (9235755).

Almost surely, 2^218643030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218643030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295544160).

218643030 is an abundant number, since it is smaller than the sum of its proper divisors (372445290).

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

218643030 is a wasteful number, since it uses less digits than its factorization.

218643030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11182 (or 11176 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 218643030 is about 14786.5827695245. The cubic root of 218643030 is about 602.4373355854.

Adding to 218643030 its reverse (30346812), we get a palindrome (248989842).

The spelling of 218643030 in words is "two hundred eighteen million, six hundred forty-three thousand, thirty".