278555268 has 24 divisors (see below), whose sum is σ = 688195872. Its totient is φ = 87389824.

The previous prime is 278555261. The next prime is 278555269. The reversal of 278555268 is 862555872.

278555268 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (278555261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682530 + ... + 682937.

It is an arithmetic number, because the mean of its divisors is an integer number (28674828).

Almost surely, 2^278555268 is an apocalyptic number.

It is an amenable number.

278555268 is an abundant number, since it is smaller than the sum of its proper divisors (409640604).

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

278555268 is a wasteful number, since it uses less digits than its factorization.

278555268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365491 (or 1365489 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 48.

The square root of 278555268 is about 16689.9750748765. The cubic root of 278555268 is about 653.0861273782.

The spelling of 278555268 in words is "two hundred seventy-eight million, five hundred fifty-five thousand, two hundred sixty-eight".