216704 has 16 divisors (see below), whose sum is σ = 431970. Its totient is φ = 108288.

The previous prime is 216703. The next prime is 216719. The reversal of 216704 is 407612.

It can be written as a sum of positive squares in only one way, i.e., 193600 + 23104 = 440^2 + 152^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (216703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719 + ... + 974.

2²¹⁶⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

216704 is a deficient number, since it is larger than the sum of its proper divisors (215266).

216704 is an equidigital number, since it uses as much as digits as its factorization.

216704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707 (or 1695 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 216704 is about 465.5147688312. The cubic root of 216704 is about 60.0651144947.

The spelling of 216704 in words is "two hundred sixteen thousand, seven hundred four".