216944450 has 18 divisors (see below), whose sum is σ = 403710489. Its totient is φ = 86736120.

The previous prime is 216944449. The next prime is 216944473. The reversal of 216944450 is 54449612.

It can be written as a sum of positive squares in 2 ways, for example, as 212605561 + 4338889 = 14581^2 + 2083^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=10415.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216944450.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 103109 + ... + 105191.

Almost surely, 2^216944450 is an apocalyptic number.

216944450 is a deficient number, since it is larger than the sum of its proper divisors (186766039).

216944450 is an frugal number, since it uses more digits than its factorization.

216944450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4178 (or 2090 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 216944450 is about 14729.0342521158. The cubic root of 216944450 is about 600.8732192711.

The spelling of 216944450 in words is "two hundred sixteen million, nine hundred forty-four thousand, four hundred fifty".