216663732 has 36 divisors (see below), whose sum is σ = 548140320. Its totient is φ = 72160272.

The previous prime is 216663701. The next prime is 216663739. The reversal of 216663732 is 237366612.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216663739) 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, 66043 + ... + 69245.

It is an arithmetic number, because the mean of its divisors is an integer number (15226120).

Almost surely, 2^216663732 is an apocalyptic number.

It is an amenable number.

216663732 is an abundant number, since it is smaller than the sum of its proper divisors (331476588).

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

216663732 is a wasteful number, since it uses less digits than its factorization.

216663732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5092 (or 5087 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 216663732 is about 14719.5017578721. The cubic root of 216663732 is about 600.6139382521.

The spelling of 216663732 in words is "two hundred sixteen million, six hundred sixty-three thousand, seven hundred thirty-two".