216606252 has 12 divisors (see below), whose sum is σ = 505414616. Its totient is φ = 72202080.

The previous prime is 216606241. The next prime is 216606253. The reversal of 216606252 is 252606612.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (216606253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9025249 + ... + 9025272.

Almost surely, 2^216606252 is an apocalyptic number.

It is an amenable number.

216606252 is an abundant number, since it is smaller than the sum of its proper divisors (288808364).

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

216606252 is a wasteful number, since it uses less digits than its factorization.

216606252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18050528 (or 18050526 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 216606252 is about 14717.5491166159. The cubic root of 216606252 is about 600.5608200825.

The spelling of 216606252 in words is "two hundred sixteen million, six hundred six thousand, two hundred fifty-two".