260778637 has 6 divisors (see below), whose sum is σ = 303354798. Its totient is φ = 223524504.

The previous prime is 260778631. The next prime is 260778649. The reversal of 260778637 is 736877062.

It can be written as a sum of positive squares in only one way, i.e., 258759396 + 2019241 = 16086^2 + 1421^2 .

It is not a de Polignac number, because 260778637 - 2⁷ = 260778509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260778631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2660958 + ... + 2661055.

It is an arithmetic number, because the mean of its divisors is an integer number (50559133).

Almost surely, 2^260778637 is an apocalyptic number.

It is an amenable number.

260778637 is a deficient number, since it is larger than the sum of its proper divisors (42576161).

260778637 is an equidigital number, since it uses as much as digits as its factorization.

260778637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5322027 (or 5322020 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 46.

The square root of 260778637 is about 16148.6419552853. The cubic root of 260778637 is about 638.8869300485.

The spelling of 260778637 in words is "two hundred sixty million, seven hundred seventy-eight thousand, six hundred thirty-seven".