216284 has 12 divisors (see below), whose sum is σ = 382200. Its totient is φ = 107088.

The previous prime is 216263. The next prime is 216289. The reversal of 216284 is 482612.

Added to its reverse (482612) it gives a square (698896 = 836²).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216289) by changing a digit.

216284 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362 + ... + 750.

It is an arithmetic number, because the mean of its divisors is an integer number (31850).

2²¹⁶²⁸⁴ is an apocalyptic number.

It is an amenable number.

216284 is a deficient number, since it is larger than the sum of its proper divisors (165916).

216284 is a wasteful number, since it uses less digits than its factorization.

216284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 530 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 216284 is about 465.0634365331. The cubic root of 216284 is about 60.0262847798.

Adding to 216284 its reverse (482612), we get a palindrome (698896).

The spelling of 216284 in words is "two hundred sixteen thousand, two hundred eighty-four".