216018320 has 80 divisors (see below), whose sum is σ = 607782528. Its totient is φ = 69703680.

The previous prime is 216018317. The next prime is 216018331. The reversal of 216018320 is 23810612.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1826 + ... + 20865.

Almost surely, 2^216018320 is an apocalyptic number.

216018320 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 216018320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303891264).

216018320 is an abundant number, since it is smaller than the sum of its proper divisors (391764208).

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

216018320 is a wasteful number, since it uses less digits than its factorization.

216018320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22728 (or 22722 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 216018320 is about 14697.5617025410. The cubic root of 216018320 is about 600.0169624834.

Adding to 216018320 its reverse (23810612), we get a palindrome (239828932).

The spelling of 216018320 in words is "two hundred sixteen million, eighteen thousand, three hundred twenty".