216044285 has 4 divisors (see below), whose sum is σ = 259253148. Its totient is φ = 172835424.

The previous prime is 216044263. The next prime is 216044333. The reversal of 216044285 is 582440612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45454564 + 170589721 = 6742^2 + 13061^2 .

It is a cyclic number.

It is not a de Polignac number, because 216044285 - 2¹² = 216040189 is a prime.

It is a super-2 number, since 2×216044285² = 93350266162322450, which contains 22 as substring.

It is a Duffinian 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, 21604424 + ... + 21604433.

It is an arithmetic number, because the mean of its divisors is an integer number (64813287).

Almost surely, 2^216044285 is an apocalyptic number.

It is an amenable number.

216044285 is a deficient number, since it is larger than the sum of its proper divisors (43208863).

216044285 is an equidigital number, since it uses as much as digits as its factorization.

216044285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43208862.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 216044285 is about 14698.4449857800. Note that the first 3 decimals coincide. The cubic root of 216044285 is about 600.0410018276.

Adding to 216044285 its reverse (582440612), we get a palindrome (798484897).

The spelling of 216044285 in words is "two hundred sixteen million, forty-four thousand, two hundred eighty-five".