278678280 has 64 divisors (see below), whose sum is σ = 885219840. Its totient is φ = 69942272.

The previous prime is 278678273. The next prime is 278678287. The reversal of 278678280 is 82876872.

278678280 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (278678273) and next prime (278678287).

It is not an unprimeable number, because it can be changed into a prime (278678287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66264 + ... + 70343.

It is an arithmetic number, because the mean of its divisors is an integer number (13831560).

Almost surely, 2^278678280 is an apocalyptic number.

278678280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278678280 is an abundant number, since it is smaller than the sum of its proper divisors (606541560).

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

278678280 is a wasteful number, since it uses less digits than its factorization.

278678280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136638 (or 136634 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The square root of 278678280 is about 16693.6598743355. The cubic root of 278678280 is about 653.1822490663.

The spelling of 278678280 in words is "two hundred seventy-eight million, six hundred seventy-eight thousand, two hundred eighty".