260728217 has 4 divisors (see below), whose sum is σ = 260760756. Its totient is φ = 260695680.

The previous prime is 260728163. The next prime is 260728219. The reversal of 260728217 is 712827062.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 712827062 = 2 ⋅356413531.

It can be written as a sum of positive squares in 2 ways, for example, as 22458121 + 238270096 = 4739^2 + 15436^2 .

It is a cyclic number.

It is not a de Polignac number, because 260728217 - 2¹⁴ = 260711833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260728219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5153 + ... + 23409.

It is an arithmetic number, because the mean of its divisors is an integer number (65190189).

Almost surely, 2^260728217 is an apocalyptic number.

It is an amenable number.

260728217 is a deficient number, since it is larger than the sum of its proper divisors (32539).

260728217 is a wasteful number, since it uses less digits than its factorization.

260728217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32538.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 260728217 is about 16147.0807578336. The cubic root of 260728217 is about 638.8457523972.

The spelling of 260728217 in words is "two hundred sixty million, seven hundred twenty-eight thousand, two hundred seventeen".