216878 has 4 divisors (see below), whose sum is σ = 325320. Its totient is φ = 108438.

The previous prime is 216877. The next prime is 216899. The reversal of 216878 is 878612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54218 + ... + 54221.

It is an arithmetic number, because the mean of its divisors is an integer number (81330).

2²¹⁶⁸⁷⁸ is an apocalyptic number.

216878 is a deficient number, since it is larger than the sum of its proper divisors (108442).

216878 is a wasteful number, since it uses less digits than its factorization.

216878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108441.

The product of its digits is 5376, while the sum is 32.

The square root of 216878 is about 465.7016212126. The cubic root of 216878 is about 60.0811863929.

The spelling of 216878 in words is "two hundred sixteen thousand, eight hundred seventy-eight".