216855330 has 64 divisors (see below), whose sum is σ = 548674560. Its totient is φ = 54768896.

The previous prime is 216855329. The next prime is 216855343. The reversal of 216855330 is 33558612.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216855291 and 216855300.

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, 43759 + ... + 48461.

It is an arithmetic number, because the mean of its divisors is an integer number (8573040).

Almost surely, 2^216855330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216855330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274337280).

216855330 is an abundant number, since it is smaller than the sum of its proper divisors (331819230).

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

216855330 is a wasteful number, since it uses less digits than its factorization.

216855330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 216855330 is about 14726.0086241996. The cubic root of 216855330 is about 600.7909291492.

The spelling of 216855330 in words is "two hundred sixteen million, eight hundred fifty-five thousand, three hundred thirty".