278065 has 8 divisors (see below), whose sum is σ = 351360. Its totient is φ = 210672.

The previous prime is 278063. The next prime is 278071. The reversal of 278065 is 560872.

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

It is not a de Polignac number, because 278065 - 2¹ = 278063 is a prime.

It is an Ulam number.

278065 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (278063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1369 + ... + 1558.

It is an arithmetic number, because the mean of its divisors is an integer number (43920).

2²⁷⁸⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

278065 is a deficient number, since it is larger than the sum of its proper divisors (73295).

278065 is a wasteful number, since it uses less digits than its factorization.

278065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 278065 is about 527.3186892193. The cubic root of 278065 is about 65.2702750125.

The spelling of 278065 in words is "two hundred seventy-eight thousand, sixty-five".