216690912 has 72 divisors (see below), whose sum is σ = 643026384. Its totient is φ = 69087744.

The previous prime is 216690911. The next prime is 216690923. The reversal of 216690912 is 219096612.

It is a tau number, because it is divible by the number of its divisors (72).

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 (216690911) 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, 9733 + ... + 22980.

It is an arithmetic number, because the mean of its divisors is an integer number (8930922).

Almost surely, 2^216690912 is an apocalyptic number.

It is an amenable number.

216690912 is an abundant number, since it is smaller than the sum of its proper divisors (426335472).

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

216690912 is a wasteful number, since it uses less digits than its factorization.

216690912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32752 (or 32741 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 216690912 is about 14720.4249938648. The cubic root of 216690912 is about 600.6390524450.

The spelling of 216690912 in words is "two hundred sixteen million, six hundred ninety thousand, nine hundred twelve".