278878 has 4 divisors (see below), whose sum is σ = 418320. Its totient is φ = 139438.

The previous prime is 278867. The next prime is 278879. The reversal of 278878 is 878872.

It is a semiprime because it is the product of two primes.

It is a d-powerful number, because it can be written as 2¹³ + 7 + 8⁴ + 8⁴ + 7³ + 8⁶ .

It is a self number, because there is not a number n which added to its sum of digits gives 278878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69718 + ... + 69721.

It is an arithmetic number, because the mean of its divisors is an integer number (104580).

2²⁷⁸⁸⁷⁸ is an apocalyptic number.

278878 is a deficient number, since it is larger than the sum of its proper divisors (139442).

278878 is a wasteful number, since it uses less digits than its factorization.

278878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139441.

The product of its digits is 50176, while the sum is 40.

The square root of 278878 is about 528.0890076493. The cubic root of 278878 is about 65.3338250229. Note that the first 3 decimals are identical.

It can be divided in two parts, 278 and 878, that added together give a square (1156 = 34²).

The spelling of 278878 in words is "two hundred seventy-eight thousand, eight hundred seventy-eight".