260278385 has 4 divisors (see below), whose sum is σ = 312334068. Its totient is φ = 208222704.

The previous prime is 260278379. The next prime is 260278391. The reversal of 260278385 is 583872062.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (260278379) and next prime (260278391).

It can be written as a sum of positive squares in 2 ways, for example, as 152201569 + 108076816 = 12337^2 + 10396^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260278385 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26027834 + ... + 26027843.

It is an arithmetic number, because the mean of its divisors is an integer number (78083517).

Almost surely, 2^260278385 is an apocalyptic number.

It is an amenable number.

260278385 is a deficient number, since it is larger than the sum of its proper divisors (52055683).

260278385 is an equidigital number, since it uses as much as digits as its factorization.

260278385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52055682.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 260278385 is about 16133.1455395406. The cubic root of 260278385 is about 638.4781426670.

The spelling of 260278385 in words is "two hundred sixty million, two hundred seventy-eight thousand, three hundred eighty-five".