218240804 has 6 divisors (see below), whose sum is σ = 381921414. Its totient is φ = 109120400.

The previous prime is 218240801. The next prime is 218240809. The reversal of 218240804 is 408042812.

It can be written as a sum of positive squares in only one way, i.e., 187416100 + 30824704 = 13690^2 + 5552^2 .

It is not an unprimeable number, because it can be changed into a prime (218240801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27280097 + ... + 27280104.

It is an arithmetic number, because the mean of its divisors is an integer number (63653569).

Almost surely, 2^218240804 is an apocalyptic number.

It is an amenable number.

218240804 is a deficient number, since it is larger than the sum of its proper divisors (163680610).

218240804 is a wasteful number, since it uses less digits than its factorization.

218240804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54560205 (or 54560203 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 218240804 is about 14772.9754619711. The cubic root of 218240804 is about 602.0676847993.

The spelling of 218240804 in words is "two hundred eighteen million, two hundred forty thousand, eight hundred four".