216234240 has 72 divisors (see below), whose sum is σ = 690610368. Its totient is φ = 57661440.

The previous prime is 216234199. The next prime is 216234283. The reversal of 216234240 is 42432612.

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 216234240.

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, 24316 + ... + 31995.

Almost surely, 2^216234240 is an apocalyptic number.

216234240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216234240 is an abundant number, since it is smaller than the sum of its proper divisors (474376128).

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

216234240 is an equidigital number, since it uses as much as digits as its factorization.

216234240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56335 (or 56321 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 216234240 is about 14704.9053040134. The cubic root of 216234240 is about 600.2168105348.

Adding to 216234240 its reverse (42432612), we get a palindrome (258666852).

The spelling of 216234240 in words is "two hundred sixteen million, two hundred thirty-four thousand, two hundred forty".