278065085 has 8 divisors (see below), whose sum is σ = 333832536. Its totient is φ = 222349120.

The previous prime is 278065063. The next prime is 278065087. The reversal of 278065085 is 580560872.

It can be written as a sum of positive squares in 4 ways, for example, as 3467044 + 274598041 = 1862^2 + 16571^2 .

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

It is not a de Polignac number, because 278065085 - 2¹² = 278060989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278065087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227 + ... + 23583.

It is an arithmetic number, because the mean of its divisors is an integer number (41729067).

Almost surely, 2^278065085 is an apocalyptic number.

It is an amenable number.

278065085 is a deficient number, since it is larger than the sum of its proper divisors (55767451).

278065085 is a wasteful number, since it uses less digits than its factorization.

278065085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25743.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 278065085 is about 16675.2836557583. The cubic root of 278065085 is about 652.7028166317.

The spelling of 278065085 in words is "two hundred seventy-eight million, sixty-five thousand, eighty-five".