216171228 has 48 divisors (see below), whose sum is σ = 620802560. Its totient is φ = 57011904.

The previous prime is 216171211. The next prime is 216171233. The reversal of 216171228 is 822171612.

216171228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×216171228³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216171195 and 216171204.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 97888 + ... + 100071.

Almost surely, 2^216171228 is an apocalyptic number.

216171228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216171228 is an abundant number, since it is smaller than the sum of its proper divisors (404631332).

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

216171228 is a wasteful number, since it uses less digits than its factorization.

216171228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197986 (or 197984 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 216171228 is about 14702.7625975529. The cubic root of 216171228 is about 600.1585025690.

The spelling of 216171228 in words is "two hundred sixteen million, one hundred seventy-one thousand, two hundred twenty-eight".