260878257 has 6 divisors (see below), whose sum is σ = 376824162. Its totient is φ = 173918832.

The previous prime is 260878223. The next prime is 260878283. The reversal of 260878257 is 752878062.

It can be written as a sum of positive squares in only one way, i.e., 253956096 + 6922161 = 15936^2 + 2631^2 .

It is not a de Polignac number, because 260878257 - 2¹⁸ = 260616113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (260878757) 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 5 ways as a sum of consecutive naturals, for example, 14493228 + ... + 14493245.

It is an arithmetic number, because the mean of its divisors is an integer number (62804027).

Almost surely, 2^260878257 is an apocalyptic number.

It is an amenable number.

260878257 is a deficient number, since it is larger than the sum of its proper divisors (115945905).

260878257 is a wasteful number, since it uses less digits than its factorization.

260878257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28986479 (or 28986476 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 260878257 is about 16151.7261306648. The cubic root of 260878257 is about 638.9682733849.

The spelling of 260878257 in words is "two hundred sixty million, eight hundred seventy-eight thousand, two hundred fifty-seven".