278085 has 8 divisors (see below), whose sum is σ = 444960. Its totient is φ = 148304.

The previous prime is 278071. The next prime is 278087. The reversal of 278085 is 580872.

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 278085 - 2⁸ = 277829 is a prime.

278085 is a lucky number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278087) 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, 9255 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (55620).

2²⁷⁸⁰⁸⁵ is an apocalyptic number.

It is an amenable number.

278085 is a deficient number, since it is larger than the sum of its proper divisors (166875).

278085 is a wasteful number, since it uses less digits than its factorization.

278085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18547.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 278085 is about 527.3376527425. The cubic root of 278085 is about 65.2718398435.

It can be divided in two parts, 2 and 78085, that added together give a palindrome (78087).

The spelling of 278085 in words is "two hundred seventy-eight thousand, eighty-five".