2560639647 has 8 divisors (see below), whose sum is σ = 3429497344. Its totient is φ = 1699437528.

The previous prime is 2560639619. The next prime is 2560639661. The reversal of 2560639647 is 7469360652.

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

It is not a de Polignac number, because 2560639647 - 2⁶ = 2560639583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2560639596 and 2560639605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2560639607) 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 7 ways as a sum of consecutive naturals, for example, 1913113 + ... + 1914450.

It is an arithmetic number, because the mean of its divisors is an integer number (428687168).

Almost surely, 2^2560639647 is an apocalyptic number.

2560639647 is a deficient number, since it is larger than the sum of its proper divisors (868857697).

2560639647 is a wasteful number, since it uses less digits than its factorization.

2560639647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827789.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The square root of 2560639647 is about 50602.7632348274. The cubic root of 2560639647 is about 1368.0946833725.

The spelling of 2560639647 in words is "two billion, five hundred sixty million, six hundred thirty-nine thousand, six hundred forty-seven".