216873228 has 96 divisors (see below), whose sum is σ = 607380480. Its totient is φ = 59351040.

The previous prime is 216873161. The next prime is 216873247. The reversal of 216873228 is 822378612.

216873228 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 (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79308 + ... + 81996.

It is an arithmetic number, because the mean of its divisors is an integer number (6326880).

Almost surely, 2^216873228 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 216873228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303690240).

216873228 is an abundant number, since it is smaller than the sum of its proper divisors (390507252).

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

216873228 is a wasteful number, since it uses less digits than its factorization.

216873228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2765 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 216873228 is about 14726.6163119706. The cubic root of 216873228 is about 600.8074573115.

The spelling of 216873228 in words is "two hundred sixteen million, eight hundred seventy-three thousand, two hundred twenty-eight".