216117256 has 8 divisors (see below), whose sum is σ = 405219870. Its totient is φ = 108058624.

The previous prime is 216117247. The next prime is 216117271. The reversal of 216117256 is 652711612.

216117256 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 195049156 + 21068100 = 13966^2 + 4590^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13507321 + ... + 13507336.

Almost surely, 2^216117256 is an apocalyptic number.

It is an amenable number.

216117256 is a deficient number, since it is larger than the sum of its proper divisors (189102614).

216117256 is a wasteful number, since it uses less digits than its factorization.

216117256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27014663 (or 27014659 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 216117256 is about 14700.9270455982. The cubic root of 216117256 is about 600.1085507304.

Adding to 216117256 its reverse (652711612), we get a palindrome (868828868).

The spelling of 216117256 in words is "two hundred sixteen million, one hundred seventeen thousand, two hundred fifty-six".