278689878 has 12 divisors (see below), whose sum is σ = 603828108. Its totient is φ = 92896620.

The previous prime is 278689871. The next prime is 278689897. The reversal of 278689878 is 878986872.

278689878 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278689871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7741368 + ... + 7741403.

It is an arithmetic number, because the mean of its divisors is an integer number (50319009).

Almost surely, 2^278689878 is an apocalyptic number.

278689878 is an abundant number, since it is smaller than the sum of its proper divisors (325138230).

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

278689878 is a wasteful number, since it uses less digits than its factorization.

278689878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15482779 (or 15482776 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 63.

The square root of 278689878 is about 16694.0072481115. The cubic root of 278689878 is about 653.1913102947.

The spelling of 278689878 in words is "two hundred seventy-eight million, six hundred eighty-nine thousand, eight hundred seventy-eight".