216468506 has 8 divisors (see below), whose sum is σ = 329150964. Its totient is φ = 106751520.

The previous prime is 216468481. The next prime is 216468509. The reversal of 216468506 is 605864612.

It can be written as a sum of positive squares in 2 ways, for example, as 194463025 + 22005481 = 13945^2 + 4691^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×216468506² = 93717228179744072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216468506.

It is not an unprimeable number, because it can be changed into a prime (216468509) 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, 741185 + ... + 741476.

Almost surely, 2^216468506 is an apocalyptic number.

216468506 is a deficient number, since it is larger than the sum of its proper divisors (112682458).

216468506 is a wasteful number, since it uses less digits than its factorization.

216468506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482736.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 216468506 is about 14712.8687209531. The cubic root of 216468506 is about 600.4334885892.

The spelling of 216468506 in words is "two hundred sixteen million, four hundred sixty-eight thousand, five hundred six".