278128345 has 16 divisors (see below), whose sum is σ = 365715648. Its totient is φ = 201375040.

The previous prime is 278128339. The next prime is 278128393. The reversal of 278128345 is 543821872.

It is a happy number.

It is not a de Polignac number, because 278128345 - 2⁷ = 278128217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278128298 and 278128307.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1347 + ... + 23623.

It is an arithmetic number, because the mean of its divisors is an integer number (22857228).

Almost surely, 2^278128345 is an apocalyptic number.

It is an amenable number.

278128345 is a deficient number, since it is larger than the sum of its proper divisors (87587303).

278128345 is a wasteful number, since it uses less digits than its factorization.

278128345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22520.

The product of its digits is 107520, while the sum is 40.

The square root of 278128345 is about 16677.1803671964. The cubic root of 278128345 is about 652.7523096601.

The spelling of 278128345 in words is "two hundred seventy-eight million, one hundred twenty-eight thousand, three hundred forty-five".