216304128 has 80 divisors (see below), whose sum is σ = 640316160. Its totient is φ = 72096768.

The previous prime is 216304117. The next prime is 216304139. The reversal of 216304128 is 821403612.

216304128 is a `hidden beast` number, since 2 + 1 + 630 + 4 + 1 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (216304117) and next prime (216304139).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 6001 + ... + 21647.

It is an arithmetic number, because the mean of its divisors is an integer number (8003952).

Almost surely, 2^216304128 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 216304128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320158080).

216304128 is an abundant number, since it is smaller than the sum of its proper divisors (424012032).

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

216304128 is an equidigital number, since it uses as much as digits as its factorization.

216304128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15674 (or 15652 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 216304128 is about 14707.2814619154. The cubic root of 216304128 is about 600.2814679390.

The spelling of 216304128 in words is "two hundred sixteen million, three hundred four thousand, one hundred twenty-eight".