216236646 has 24 divisors (see below), whose sum is σ = 468783120. Its totient is φ = 72037296.

The previous prime is 216236641. The next prime is 216236689. The reversal of 216236646 is 646632612.

216236646 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 3 + 6 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 216236646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216236641) 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 11 ways as a sum of consecutive naturals, for example, 60600 + ... + 64068.

It is an arithmetic number, because the mean of its divisors is an integer number (19532630).

Almost surely, 2^216236646 is an apocalyptic number.

216236646 is an abundant number, since it is smaller than the sum of its proper divisors (252546474).

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

216236646 is a wasteful number, since it uses less digits than its factorization.

216236646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940 (or 6937 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 216236646 is about 14704.9871132211. The cubic root of 216236646 is about 600.2190366951.

The spelling of 216236646 in words is "two hundred sixteen million, two hundred thirty-six thousand, six hundred forty-six".