216189628 has 12 divisors (see below), whose sum is σ = 380742712. Its totient is φ = 107406000.

The previous prime is 216189587. The next prime is 216189647. The reversal of 216189628 is 826981612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171498 + ... + 172753.

Almost surely, 2^216189628 is an apocalyptic number.

It is an amenable number.

216189628 is a deficient number, since it is larger than the sum of its proper divisors (164553084).

216189628 is a wasteful number, since it uses less digits than its factorization.

216189628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344412 (or 344410 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 216189628 is about 14703.3883169833. The cubic root of 216189628 is about 600.1755301251.

The spelling of 216189628 in words is "two hundred sixteen million, one hundred eighty-nine thousand, six hundred twenty-eight".