278278 has 32 divisors (see below), whose sum is σ = 564480. Its totient is φ = 99360.

The previous prime is 278269. The next prime is 278279. The reversal of 278278 is 872872.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278279) by changing a digit.

278278 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 15 ways as a sum of consecutive naturals, for example, 1933 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (17640).

2²⁷⁸²⁷⁸ is an apocalyptic number.

278278 is an abundant number, since it is smaller than the sum of its proper divisors (286202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278278 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (278277) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (172).

278278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172.

The product of its digits is 12544, while the sum is 34.

The square root of 278278 is about 527.5206157109. The cubic root of 278278 is about 65.2869366087.

The spelling of 278278 in words is "two hundred seventy-eight thousand, two hundred seventy-eight".