216304356 has 36 divisors (see below), whose sum is σ = 517368656. Its totient is φ = 70336320.

The previous prime is 216304339. The next prime is 216304367. The reversal of 216304356 is 653403612.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 14811 + ... + 25533.

Almost surely, 2^216304356 is an apocalyptic number.

It is an amenable number.

216304356 is an abundant number, since it is smaller than the sum of its proper divisors (301064300).

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

216304356 is a wasteful number, since it uses less digits than its factorization.

216304356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10812 (or 10769 counting only the distinct ones).

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

The square root of 216304356 is about 14707.2892131759. The cubic root of 216304356 is about 600.2816788521.

Adding to 216304356 its reverse (653403612), we get a palindrome (869707968).

The spelling of 216304356 in words is "two hundred sixteen million, three hundred four thousand, three hundred fifty-six".