216443450 has 24 divisors (see below), whose sum is σ = 403028892. Its totient is φ = 86481920.

The previous prime is 216443449. The next prime is 216443471. The reversal of 216443450 is 54344612.

It can be written as a sum of positive squares in 6 ways, for example, as 24870169 + 191573281 = 4987^2 + 13841^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59072 + ... + 62628.

Almost surely, 2^216443450 is an apocalyptic number.

216443450 is a deficient number, since it is larger than the sum of its proper divisors (186585442).

216443450 is a wasteful number, since it uses less digits than its factorization.

216443450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786 (or 4781 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 216443450 is about 14712.0171968361. The cubic root of 216443450 is about 600.4103211821.

The spelling of 216443450 in words is "two hundred sixteen million, four hundred forty-three thousand, four hundred fifty".