216530532 has 18 divisors (see below), whose sum is σ = 547341158. Its totient is φ = 72176832.

The previous prime is 216530459. The next prime is 216530537. The reversal of 216530532 is 235035612.

216530532 is a `hidden beast` number, since 2 + 1 + 653 + 0 + 5 + 3 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 212751396 + 3779136 = 14586^2 + 1944^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 216530496 and 216530505.

It is not an unprimeable number, because it can be changed into a prime (216530537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3007333 + ... + 3007404.

Almost surely, 2^216530532 is an apocalyptic number.

It is an amenable number.

216530532 is an abundant number, since it is smaller than the sum of its proper divisors (330810626).

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

216530532 is a wasteful number, since it uses less digits than its factorization.

216530532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014747 (or 6014742 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 216530532 is about 14714.9764525805. The cubic root of 216530532 is about 600.4908316976.

The spelling of 216530532 in words is "two hundred sixteen million, five hundred thirty thousand, five hundred thirty-two".