260128705 has 8 divisors (see below), whose sum is σ = 317272104. Its totient is φ = 204691200.

The previous prime is 260128651. The next prime is 260128741. The reversal of 260128705 is 507821062.

It can be written as a sum of positive squares in 4 ways, for example, as 11498881 + 248629824 = 3391^2 + 15768^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-260128705 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426136 + ... + 426745.

It is an arithmetic number, because the mean of its divisors is an integer number (39659013).

Almost surely, 2^260128705 is an apocalyptic number.

It is an amenable number.

260128705 is a deficient number, since it is larger than the sum of its proper divisors (57143399).

260128705 is an equidigital number, since it uses as much as digits as its factorization.

260128705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852947.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 260128705 is about 16128.5059754461. The cubic root of 260128705 is about 638.3557279253.

Adding to 260128705 its reverse (507821062), we get a palindrome (767949767).

The spelling of 260128705 in words is "two hundred sixty million, one hundred twenty-eight thousand, seven hundred five".