216688552 has 8 divisors (see below), whose sum is σ = 406291050. Its totient is φ = 108344272.

The previous prime is 216688517. The next prime is 216688553. The reversal of 216688552 is 255886612.

It can be written as a sum of positive squares in only one way, i.e., 189502756 + 27185796 = 13766^2 + 5214^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 216688499 and 216688508.

It is not an unprimeable number, because it can be changed into a prime (216688553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13543027 + ... + 13543042.

Almost surely, 2^216688552 is an apocalyptic number.

It is an amenable number.

216688552 is a deficient number, since it is larger than the sum of its proper divisors (189602498).

216688552 is a wasteful number, since it uses less digits than its factorization.

216688552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27086075 (or 27086071 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The square root of 216688552 is about 14720.3448329175. The cubic root of 216688552 is about 600.6368718993.

The spelling of 216688552 in words is "two hundred sixteen million, six hundred eighty-eight thousand, five hundred fifty-two".