256706560 has 192 divisors, whose sum is σ = 700539840. Its totient is φ = 89456640.

The previous prime is 256706557. The next prime is 256706561. The reversal of 256706560 is 65607652.

It is not an unprimeable number, because it can be changed into a prime (256706561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4843494 + ... + 4843546.

It is an arithmetic number, because the mean of its divisors is an integer number (3648645).

Almost surely, 2^256706560 is an apocalyptic number.

256706560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256706560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350269920).

256706560 is an abundant number, since it is smaller than the sum of its proper divisors (443833280).

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

256706560 is a wasteful number, since it uses less digits than its factorization.

256706560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 256706560 is about 16022.0647857884. The cubic root of 256706560 is about 635.5440477665.

The spelling of 256706560 in words is "two hundred fifty-six million, seven hundred six thousand, five hundred sixty".