216875656 has 8 divisors (see below), whose sum is σ = 406641870. Its totient is φ = 108437824.

The previous prime is 216875653. The next prime is 216875663. The reversal of 216875656 is 656578612.

It can be written as a sum of positive squares in only one way, i.e., 145202500 + 71673156 = 12050^2 + 8466^2 .

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

It is not an unprimeable number, because it can be changed into a prime (216875653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13554721 + ... + 13554736.

Almost surely, 2^216875656 is an apocalyptic number.

It is an amenable number.

216875656 is a deficient number, since it is larger than the sum of its proper divisors (189766214).

216875656 is a wasteful number, since it uses less digits than its factorization.

216875656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27109463 (or 27109459 counting only the distinct ones).

The product of its digits is 604800, while the sum is 46.

The square root of 216875656 is about 14726.6987475130. The cubic root of 216875656 is about 600.8096994125.

The spelling of 216875656 in words is "two hundred sixteen million, eight hundred seventy-five thousand, six hundred fifty-six".