216328788 has 162 divisors, whose sum is σ = 628384302. Its totient is φ = 62674560.

The previous prime is 216328787. The next prime is 216328789. The reversal of 216328788 is 887823612.

216328788 is a `hidden beast` number, since 2 + 1 + 632 + 8 + 7 + 8 + 8 = 666.

216328788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216328787) and next prime (216328789).

It can be written as a sum of positive squares in 3 ways, for example, as 11209104 + 205119684 = 3348^2 + 14322^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216328787) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 5846706 + ... + 5846742.

Almost surely, 2^216328788 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 216328788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314192151).

216328788 is an abundant number, since it is smaller than the sum of its proper divisors (412055514).

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

216328788 is a wasteful number, since it uses less digits than its factorization.

216328788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 86 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 216328788 is about 14708.1197982611. The cubic root of 216328788 is about 600.3042789977.

The spelling of 216328788 in words is "two hundred sixteen million, three hundred twenty-eight thousand, seven hundred eighty-eight".