216035550 has 72 divisors (see below), whose sum is σ = 605679984. Its totient is φ = 55102080.

The previous prime is 216035539. The next prime is 216035551. The reversal of 216035550 is 55530612.

216035550 is a `hidden beast` number, since 2 + 1 + 603 + 5 + 5 + 50 = 666.

216035550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216035551) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 87 + ... + 20786.

It is an arithmetic number, because the mean of its divisors is an integer number (8412222).

Almost surely, 2^216035550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216035550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302839992).

216035550 is an abundant number, since it is smaller than the sum of its proper divisors (389644434).

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

216035550 is a wasteful number, since it uses less digits than its factorization.

216035550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20914 (or 20906 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 216035550 is about 14698.1478425004. The cubic root of 216035550 is about 600.0329148610.

The spelling of 216035550 in words is "two hundred sixteen million, thirty-five thousand, five hundred fifty".