216378 has 16 divisors (see below), whose sum is σ = 480960. Its totient is φ = 72108.

The previous prime is 216373. The next prime is 216379. The reversal of 216378 is 873612.

216378 is a `hidden beast` number, since 21 + 637 + 8 = 666.

216378 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (216371) 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, 1950 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (30060).

2²¹⁶³⁷⁸ is an apocalyptic number.

216378 is an abundant number, since it is smaller than the sum of its proper divisors (264582).

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

216378 is a wasteful number, since it uses less digits than its factorization.

216378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018 (or 4012 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 216378 is about 465.1644870366. The cubic root of 216378 is about 60.0349796032.

The spelling of 216378 in words is "two hundred sixteen thousand, three hundred seventy-eight".