278355 has 32 divisors (see below), whose sum is σ = 557568. Its totient is φ = 115200.

The previous prime is 278353. The next prime is 278363. The reversal of 278355 is 553872.

It is a happy number.

It is not a de Polignac number, because 278355 - 2¹ = 278353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (278353) 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 31 ways as a sum of consecutive naturals, for example, 1035 + ... + 1275.

It is an arithmetic number, because the mean of its divisors is an integer number (17424).

2²⁷⁸³⁵⁵ is an apocalyptic number.

278355 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

278355 is a wasteful number, since it uses less digits than its factorization.

278355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267.

The product of its digits is 8400, while the sum is 30.

The square root of 278355 is about 527.5935935926. The cubic root of 278355 is about 65.2929577225.

The spelling of 278355 in words is "two hundred seventy-eight thousand, three hundred fifty-five".