278204 has 12 divisors (see below), whose sum is σ = 491064. Its totient is φ = 137904.

The previous prime is 278191. The next prime is 278207. The reversal of 278204 is 402872.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 278204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278207) by changing a digit.

278204 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 3 ways as a sum of consecutive naturals, for example, 407 + ... + 849.

It is an arithmetic number, because the mean of its divisors is an integer number (40922).

2²⁷⁸²⁰⁴ is an apocalyptic number.

It is an amenable number.

278204 is a deficient number, since it is larger than the sum of its proper divisors (212860).

278204 is a wasteful number, since it uses less digits than its factorization.

278204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 278204 is about 527.4504716085. The cubic root of 278204 is about 65.2811490370.

The spelling of 278204 in words is "two hundred seventy-eight thousand, two hundred four".