216678 has 48 divisors (see below), whose sum is σ = 558144. Its totient is φ = 55440.

The previous prime is 216661. The next prime is 216679. The reversal of 216678 is 876612.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3201 + ... + 3267.

It is an arithmetic number, because the mean of its divisors is an integer number (11628).

2²¹⁶⁶⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279072).

216678 is an abundant number, since it is smaller than the sum of its proper divisors (341466).

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

216678 is a wasteful number, since it uses less digits than its factorization.

216678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 90 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 216678 is about 465.4868419193. The cubic root of 216678 is about 60.0627122079.

The spelling of 216678 in words is "two hundred sixteen thousand, six hundred seventy-eight".