278325 has 18 divisors (see below), whose sum is σ = 498914. Its totient is φ = 148320.

The previous prime is 278321. The next prime is 278329. The reversal of 278325 is 523872.

It is an interprime number because it is at equal distance from previous prime (278321) and next prime (278329).

It can be written as a sum of positive squares in 3 ways, for example, as 39204 + 239121 = 198^2 + 489^2 .

It is not a de Polignac number, because 278325 - 2² = 278321 is a prime.

It is a d-powerful number, because it can be written as 2⁸ + 7² + 3⁵ + 8 + 2¹⁸ + 5⁶ .

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278325.

It is not an unprimeable number, because it can be changed into a prime (278321) 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 17 ways as a sum of consecutive naturals, for example, 394 + ... + 843.

2²⁷⁸³²⁵ is an apocalyptic number.

278325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

278325 is a deficient number, since it is larger than the sum of its proper divisors (220589).

278325 is a wasteful number, since it uses less digits than its factorization.

278325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 1245 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 278325 is about 527.5651618521. The cubic root of 278325 is about 65.2906119661.

The spelling of 278325 in words is "two hundred seventy-eight thousand, three hundred twenty-five".