256605560 has 16 divisors (see below), whose sum is σ = 577362600. Its totient is φ = 102642208.

The previous prime is 256605533. The next prime is 256605563. The reversal of 256605560 is 65506652.

It is a self number, because there is not a number n which added to its sum of digits gives 256605560.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256605563) 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, 3207530 + ... + 3207609.

Almost surely, 2^256605560 is an apocalyptic number.

256605560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256605560 is an abundant number, since it is smaller than the sum of its proper divisors (320757040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256605560 is a wasteful number, since it uses less digits than its factorization.

256605560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415150 (or 6415146 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 256605560 is about 16018.9125723315. The cubic root of 256605560 is about 635.4606862179.

The spelling of 256605560 in words is "two hundred fifty-six million, six hundred five thousand, five hundred sixty".