278216 has 16 divisors (see below), whose sum is σ = 529200. Its totient is φ = 137104.

The previous prime is 278209. The next prime is 278219. The reversal of 278216 is 612872.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (278219) by changing a digit.

278216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455 + ... + 873.

It is an arithmetic number, because the mean of its divisors is an integer number (33075).

2²⁷⁸²¹⁶ is an apocalyptic number.

It is an amenable number.

278216 is a deficient number, since it is larger than the sum of its proper divisors (250984).

278216 is a wasteful number, since it uses less digits than its factorization.

278216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508 (or 504 counting only the distinct ones).

The product of its digits is 1344, while the sum is 26.

The square root of 278216 is about 527.4618469615. The cubic root of 278216 is about 65.2820876319.

It can be divided in two parts, 278 and 216, that added together give a palindrome (494).

The spelling of 278216 in words is "two hundred seventy-eight thousand, two hundred sixteen".