218608 has 20 divisors (see below), whose sum is σ = 456568. Its totient is φ = 100800.

The previous prime is 218599. The next prime is 218611. The reversal of 218608 is 806812.

It is a congruent number.

It is an unprimeable number.

218608 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318 + ... + 733.

2²¹⁸⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

218608 is an abundant number, since it is smaller than the sum of its proper divisors (237960).

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

218608 is a wasteful number, since it uses less digits than its factorization.

218608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 218608 is about 467.5553443177. Note that the first 3 decimals coincide. The cubic root of 218608 is about 60.2405160603.

The spelling of 218608 in words is "two hundred eighteen thousand, six hundred eight".