216530436 has 12 divisors (see below), whose sum is σ = 505237712. Its totient is φ = 72176808.

The previous prime is 216530359. The next prime is 216530449. The reversal of 216530436 is 634035612.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9022090 + ... + 9022113.

Almost surely, 2^216530436 is an apocalyptic number.

It is an amenable number.

216530436 is an abundant number, since it is smaller than the sum of its proper divisors (288707276).

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

216530436 is a wasteful number, since it uses less digits than its factorization.

216530436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18044210 (or 18044208 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 216530436 is about 14714.9731905974. The cubic root of 216530436 is about 600.4907429539.

The spelling of 216530436 in words is "two hundred sixteen million, five hundred thirty thousand, four hundred thirty-six".