256601560 has 32 divisors (see below), whose sum is σ = 578126160. Its totient is φ = 102503296.

The previous prime is 256601551. The next prime is 256601581. The reversal of 256601560 is 65106652.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29202 + ... + 36958.

Almost surely, 2^256601560 is an apocalyptic number.

256601560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256601560 is an abundant number, since it is smaller than the sum of its proper divisors (321524600).

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

256601560 is a wasteful number, since it uses less digits than its factorization.

256601560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8595 (or 8591 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 256601560 is about 16018.7877194250. The cubic root of 256601560 is about 635.4573843202.

The spelling of 256601560 in words is "two hundred fifty-six million, six hundred one thousand, five hundred sixty".