216018240 has 112 divisors (see below), whose sum is σ = 701942208. Its totient is φ = 56254464.

The previous prime is 216018233. The next prime is 216018241. The reversal of 216018240 is 42810612.

216018240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 216018240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216018241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38664 + ... + 43896.

Almost surely, 2^216018240 is an apocalyptic number.

216018240 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 216018240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350971104).

216018240 is an abundant number, since it is smaller than the sum of its proper divisors (485923968).

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

216018240 is a wasteful number, since it uses less digits than its factorization.

216018240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5296 (or 5286 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 216018240 is about 14697.5589810009. The cubic root of 216018240 is about 600.0168884135.

Adding to 216018240 its reverse (42810612), we get a palindrome (258828852).

The spelling of 216018240 in words is "two hundred sixteen million, eighteen thousand, two hundred forty".