216656208 has 50 divisors (see below), whose sum is σ = 627069674. Its totient is φ = 72218304.

The previous prime is 216656207. The next prime is 216656227. The reversal of 216656208 is 802656612.

216656208 is a `hidden beast` number, since 21 + 6 + 6 + 5 + 620 + 8 = 666.

216656208 is digitally balanced in base 2, 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., 131056704 + 85599504 = 11448^2 + 9252^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216656207) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 82291 + ... + 84882.

Almost surely, 2^216656208 is an apocalyptic number.

It is an amenable number.

216656208 is an abundant number, since it is smaller than the sum of its proper divisors (410413466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216656208 is a wasteful number, since it uses less digits than its factorization.

216656208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167193 (or 167178 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 216656208 is about 14719.2461763502. The cubic root of 216656208 is about 600.6069857401.

The spelling of 216656208 in words is "two hundred sixteen million, six hundred fifty-six thousand, two hundred eight".