218078 has 16 divisors (see below), whose sum is σ = 384864. Its totient is φ = 90720.

The previous prime is 218077. The next prime is 218081. The reversal of 218078 is 870812.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (218077) 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, 308 + ... + 728.

It is an arithmetic number, because the mean of its divisors is an integer number (24054).

2²¹⁸⁰⁷⁸ is an apocalyptic number.

218078 is a deficient number, since it is larger than the sum of its proper divisors (166786).

218078 is a wasteful number, since it uses less digits than its factorization.

218078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 218078 is about 466.9882225496. The cubic root of 218078 is about 60.1917936739.

Multiplying 218078 by its sum of digits (26), we get a triangular number (5670028 = T₃₃₆₇).

The spelling of 218078 in words is "two hundred eighteen thousand, seventy-eight".