278806 has 32 divisors (see below), whose sum is σ = 518400. Its totient is φ = 110880.

The previous prime is 278801. The next prime is 278807. The reversal of 278806 is 608872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278801) by changing a digit.

278806 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, 9600 + ... + 9628.

It is an arithmetic number, because the mean of its divisors is an integer number (16200).

2²⁷⁸⁸⁰⁶ is an apocalyptic number.

278806 is a deficient number, since it is larger than the sum of its proper divisors (239594).

278806 is a wasteful number, since it uses less digits than its factorization.

278806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 278806 is about 528.0208329223. The cubic root of 278806 is about 65.3282019664.

Subtracting from 278806 its product of nonzero digits (5376), we obtain a triangular number (273430 = T₇₃₉).

The spelling of 278806 in words is "two hundred seventy-eight thousand, eight hundred six".