260781 has 4 divisors (see below), whose sum is σ = 347712. Its totient is φ = 173852.

The previous prime is 260773. The next prime is 260791. The reversal of 260781 is 187062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 260781 - 2³ = 260773 is a prime.

It is a super-2 number, since 2×260781² = 136013459922, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260761) by changing a digit.

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, 43461 + ... + 43466.

It is an arithmetic number, because the mean of its divisors is an integer number (86928).

2²⁶⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

260781 is a deficient number, since it is larger than the sum of its proper divisors (86931).

260781 is an equidigital number, since it uses as much as digits as its factorization.

260781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86930.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 260781 is about 510.6672106176. The cubic root of 260781 is about 63.8888859763. Note that the first 5 decimals are identical.

The spelling of 260781 in words is "two hundred sixty thousand, seven hundred eighty-one".