278560265 has 12 divisors (see below), whose sum is σ = 345409092. Its totient is φ = 215655840.

The previous prime is 278560231. The next prime is 278560279. The reversal of 278560265 is 562065872.

It can be written as a sum of positive squares in 2 ways, for example, as 64464841 + 214095424 = 8029^2 + 14632^2 .

It is not a de Polignac number, because 278560265 - 2¹⁰ = 278559241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 24182 + ... + 33791.

It is an arithmetic number, because the mean of its divisors is an integer number (28784091).

Almost surely, 2^278560265 is an apocalyptic number.

It is an amenable number.

278560265 is a deficient number, since it is larger than the sum of its proper divisors (66848827).

278560265 is an equidigital number, since it uses as much as digits as its factorization.

278560265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58040 (or 58009 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 278560265 is about 16690.1247748481. The cubic root of 278560265 is about 653.0900325899.

The spelling of 278560265 in words is "two hundred seventy-eight million, five hundred sixty thousand, two hundred sixty-five".