216338646 has 16 divisors (see below), whose sum is σ = 446635008. Its totient is φ = 69786600.

The previous prime is 216338641. The next prime is 216338659. The reversal of 216338646 is 646833612.

It is a super-2 number, since 2×216338646² = 93604819506226632, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216338641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 581370 + ... + 581741.

It is an arithmetic number, because the mean of its divisors is an integer number (27914688).

Almost surely, 2^216338646 is an apocalyptic number.

216338646 is an abundant number, since it is smaller than the sum of its proper divisors (230296362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216338646 is a wasteful number, since it uses less digits than its factorization.

216338646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163147.

The product of its digits is 124416, while the sum is 39.

The square root of 216338646 is about 14708.4549154559. The cubic root of 216338646 is about 600.3133973861.

The spelling of 216338646 in words is "two hundred sixteen million, three hundred thirty-eight thousand, six hundred forty-six".