216680 has 16 divisors (see below), whose sum is σ = 487620. Its totient is φ = 86656.

The previous prime is 216679. The next prime is 216703. The reversal of 216680 is 86612.

216680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 195364 + 21316 = 442^2 + 146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2669 + ... + 2748.

2²¹⁶⁶⁸⁰ is an apocalyptic number.

216680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216680 is an abundant number, since it is smaller than the sum of its proper divisors (270940).

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

216680 is a wasteful number, since it uses less digits than its factorization.

216680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428 (or 5424 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 216680 is about 465.4889902028. The cubic root of 216680 is about 60.0628970060.

The spelling of 216680 in words is "two hundred sixteen thousand, six hundred eighty".