278206 has 8 divisors (see below), whose sum is σ = 421344. Its totient is φ = 137760.

The previous prime is 278191. The next prime is 278207. The reversal of 278206 is 602872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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

278206 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, 390 + ... + 841.

It is an arithmetic number, because the mean of its divisors is an integer number (52668).

2²⁷⁸²⁰⁶ is an apocalyptic number.

278206 is a deficient number, since it is larger than the sum of its proper divisors (143138).

278206 is a wasteful number, since it uses less digits than its factorization.

278206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 278206 is about 527.4523675177. The cubic root of 278206 is about 65.2813054714.

It can be divided in two parts, 278 and 206, that added together give a palindrome (484).

The spelling of 278206 in words is "two hundred seventy-eight thousand, two hundred six".