216422644 has 12 divisors (see below), whose sum is σ = 379741600. Its totient is φ = 107925048.

The previous prime is 216422629. The next prime is 216422653. The reversal of 216422644 is 446224612.

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, 69864 + ... + 72895.

Almost surely, 2^216422644 is an apocalyptic number.

It is an amenable number.

216422644 is a deficient number, since it is larger than the sum of its proper divisors (163318956).

216422644 is a wasteful number, since it uses less digits than its factorization.

216422644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143142 (or 143140 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 216422644 is about 14711.3100708265. The cubic root of 216422644 is about 600.3910820730.

The spelling of 216422644 in words is "two hundred sixteen million, four hundred twenty-two thousand, six hundred forty-four".