278755 has 8 divisors (see below), whose sum is σ = 337392. Its totient is φ = 221088.

The previous prime is 278753. The next prime is 278767. The reversal of 278755 is 557872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 278755 - 2¹ = 278753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 278755.

It is not an unprimeable number, because it can be changed into a prime (278753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844 + ... + 1126.

It is an arithmetic number, because the mean of its divisors is an integer number (42174).

2²⁷⁸⁷⁵⁵ is an apocalyptic number.

278755 is a deficient number, since it is larger than the sum of its proper divisors (58637).

278755 is a wasteful number, since it uses less digits than its factorization.

278755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485.

The product of its digits is 19600, while the sum is 34.

The square root of 278755 is about 527.9725371646. The cubic root of 278755 is about 65.3242183822.

The spelling of 278755 in words is "two hundred seventy-eight thousand, seven hundred fifty-five".