216605358 has 48 divisors (see below), whose sum is σ = 498001920. Its totient is φ = 67849488.

The previous prime is 216605351. The next prime is 216605369. The reversal of 216605358 is 853506612.

216605358 is a `hidden beast` number, since 2 + 16 + 605 + 35 + 8 = 666.

216605358 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216605358² = 93835762228616328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216605351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40941 + ... + 45927.

It is an arithmetic number, because the mean of its divisors is an integer number (10375040).

Almost surely, 2^216605358 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216605358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249000960).

216605358 is an abundant number, since it is smaller than the sum of its proper divisors (281396562).

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

216605358 is a wasteful number, since it uses less digits than its factorization.

216605358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141 (or 5138 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 216605358 is about 14717.5187446798. The cubic root of 216605358 is about 600.5599938489.

The spelling of 216605358 in words is "two hundred sixteen million, six hundred five thousand, three hundred fifty-eight".