218630480 has 40 divisors (see below), whose sum is σ = 511286472. Its totient is φ = 86941184.

The previous prime is 218630471. The next prime is 218630483. The reversal of 218630480 is 84036812.

218630480 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 86564416 + 132066064 = 9304^2 + 11492^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218630483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5942 + ... + 21738.

Almost surely, 2^218630480 is an apocalyptic number.

218630480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218630480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255643236).

218630480 is an abundant number, since it is smaller than the sum of its proper divisors (292655992).

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

218630480 is a wasteful number, since it uses less digits than its factorization.

218630480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15983 (or 15977 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 218630480 is about 14786.1583922262. The cubic root of 218630480 is about 602.4258088314.

The spelling of 218630480 in words is "two hundred eighteen million, six hundred thirty thousand, four hundred eighty".