216678772 has 6 divisors (see below), whose sum is σ = 379187858. Its totient is φ = 108339384.

The previous prime is 216678757. The next prime is 216678779. The reversal of 216678772 is 277876612.

It can be written as a sum of positive squares in only one way, i.e., 214446736 + 2232036 = 14644^2 + 1494^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216678779) 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 as a sum of consecutive naturals, namely, 27084843 + ... + 27084850.

Almost surely, 2^216678772 is an apocalyptic number.

It is an amenable number.

216678772 is a deficient number, since it is larger than the sum of its proper divisors (162509086).

216678772 is a wasteful number, since it uses less digits than its factorization.

216678772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54169697 (or 54169695 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The square root of 216678772 is about 14720.0126358641. The cubic root of 216678772 is about 600.6278354013.

The spelling of 216678772 in words is "two hundred sixteen million, six hundred seventy-eight thousand, seven hundred seventy-two".