218648 has 16 divisors (see below), whose sum is σ = 414960. Its totient is φ = 108000.

The previous prime is 218641. The next prime is 218651. The reversal of 218648 is 846812.

It is a self number, because there is not a number n which added to its sum of digits gives 218648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218641) by changing a digit.

218648 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, 1118 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (25935).

2²¹⁸⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

218648 is a deficient number, since it is larger than the sum of its proper divisors (196312).

218648 is a wasteful number, since it uses less digits than its factorization.

218648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 334 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 218648 is about 467.5981180458. The cubic root of 218648 is about 60.2441900242.

The spelling of 218648 in words is "two hundred eighteen thousand, six hundred forty-eight".