216434256 has 20 divisors (see below), whose sum is σ = 559121952. Its totient is φ = 72144736.

The previous prime is 216434237. The next prime is 216434287. The reversal of 216434256 is 652434612.

It is a congruent number.

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, 2254476 + ... + 2254571.

Almost surely, 2^216434256 is an apocalyptic number.

It is an amenable number.

216434256 is an abundant number, since it is smaller than the sum of its proper divisors (342687696).

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

216434256 is a wasteful number, since it uses less digits than its factorization.

216434256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4509058 (or 4509052 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 216434256 is about 14711.7047278689. The cubic root of 216434256 is about 600.4018197303.

Adding to 216434256 its reverse (652434612), we get a palindrome (868868868).

The spelling of 216434256 in words is "two hundred sixteen million, four hundred thirty-four thousand, two hundred fifty-six".