216229284 has 96 divisors (see below), whose sum is σ = 580567680. Its totient is φ = 69552000.

The previous prime is 216229261. The next prime is 216229289. The reversal of 216229284 is 482922612.

216229284 is a `hidden beast` number, since 2 + 1 + 622 + 9 + 28 + 4 = 666.

216229284 is digitally balanced in base 2, 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 (36).

It is not an unprimeable number, because it can be changed into a prime (216229289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 468814 + ... + 469274.

It is an arithmetic number, because the mean of its divisors is an integer number (6047580).

Almost surely, 2^216229284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216229284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290283840).

216229284 is an abundant number, since it is smaller than the sum of its proper divisors (364338396).

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

216229284 is a wasteful number, since it uses less digits than its factorization.

216229284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 610 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 216229284 is about 14704.7367878517. The cubic root of 216229284 is about 600.2122249255.

The spelling of 216229284 in words is "two hundred sixteen million, two hundred twenty-nine thousand, two hundred eighty-four".