216626869 has 8 divisors (see below), whose sum is σ = 229907160. Its totient is φ = 203406336.

The previous prime is 216626797. The next prime is 216626881. The reversal of 216626869 is 968626612.

It can be written as a sum of positive squares in 4 ways, for example, as 64400625 + 152226244 = 8025^2 + 12338^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216626869 - 2¹⁵ = 216594101 is a prime.

It is a super-2 number, since 2×216626869² = 93854400745486322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216606869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7354 + ... + 22075.

It is an arithmetic number, because the mean of its divisors is an integer number (28738395).

Almost surely, 2^216626869 is an apocalyptic number.

It is an amenable number.

216626869 is a deficient number, since it is larger than the sum of its proper divisors (13280291).

216626869 is a wasteful number, since it uses less digits than its factorization.

216626869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29879.

The product of its digits is 373248, while the sum is 46.

The square root of 216626869 is about 14718.2495222768. The cubic root of 216626869 is about 600.5798736563.

The spelling of 216626869 in words is "two hundred sixteen million, six hundred twenty-six thousand, eight hundred sixty-nine".