278978 has 8 divisors (see below), whose sum is σ = 478272. Its totient is φ = 119556.

The previous prime is 278947. The next prime is 278981. The reversal of 278978 is 879872.

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

It is an unprimeable number.

278978 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, 9950 + ... + 9977.

It is an arithmetic number, because the mean of its divisors is an integer number (59784).

2²⁷⁸⁹⁷⁸ is an apocalyptic number.

278978 is a deficient number, since it is larger than the sum of its proper divisors (199294).

278978 is a wasteful number, since it uses less digits than its factorization.

278978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19936.

The product of its digits is 56448, while the sum is 41.

The square root of 278978 is about 528.1836801720. The cubic root of 278978 is about 65.3416332183.

The spelling of 278978 in words is "two hundred seventy-eight thousand, nine hundred seventy-eight".