278988 has 24 divisors (see below), whose sum is σ = 662592. Its totient is φ = 91344.

The previous prime is 278981. The next prime is 279001. The reversal of 278988 is 889872.

It is a happy number.

278988 is nontrivially palindromic in base 5.

278988 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278988.

It is not an unprimeable number, because it can be changed into a prime (278981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631 + ... + 977.

It is an arithmetic number, because the mean of its divisors is an integer number (27608).

2²⁷⁸⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

278988 is an abundant number, since it is smaller than the sum of its proper divisors (383604).

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

278988 is a wasteful number, since it uses less digits than its factorization.

278988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 419 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 278988 is about 528.1931464909. The cubic root of 278988 is about 65.3424139352.

The spelling of 278988 in words is "two hundred seventy-eight thousand, nine hundred eighty-eight".