216606 has 16 divisors (see below), whose sum is σ = 466704. Its totient is φ = 66624.

The previous prime is 216577. The next prime is 216607. The reversal of 216606 is 606612.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216606.

It is not an unprimeable number, because it can be changed into a prime (216607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1311 + ... + 1466.

It is an arithmetic number, because the mean of its divisors is an integer number (29169).

2²¹⁶⁶⁰⁶ is an apocalyptic number.

216606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216606 is an abundant number, since it is smaller than the sum of its proper divisors (250098).

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

216606 is a wasteful number, since it uses less digits than its factorization.

216606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 216606 is about 465.4094971098. The cubic root of 216606 is about 60.0560587185.

The spelling of 216606 in words is "two hundred sixteen thousand, six hundred six".