218384464 has 40 divisors (see below), whose sum is σ = 431703272. Its totient is φ = 106997760.

The previous prime is 218384449. The next prime is 218384473. The reversal of 218384464 is 464483812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30913600 + 187470864 = 5560^2 + 13692^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210892 + ... + 211924.

Almost surely, 2^218384464 is an apocalyptic number.

It is an amenable number.

218384464 is a deficient number, since it is larger than the sum of its proper divisors (213318808).

218384464 is a wasteful number, since it uses less digits than its factorization.

218384464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1289 counting only the distinct ones).

The product of its digits is 147456, while the sum is 40.

The square root of 218384464 is about 14777.8369188457. The cubic root of 218384464 is about 602.1997622577.

The spelling of 218384464 in words is "two hundred eighteen million, three hundred eighty-four thousand, four hundred sixty-four".