256558260 has 96 divisors (see below), whose sum is σ = 827430912. Its totient is φ = 58181760.

The previous prime is 256558249. The next prime is 256558283. The reversal of 256558260 is 62855652.

It is a happy number.

256558260 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52689 + ... + 57351.

It is an arithmetic number, because the mean of its divisors is an integer number (8619072).

Almost surely, 2^256558260 is an apocalyptic number.

256558260 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 256558260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413715456).

256558260 is an abundant number, since it is smaller than the sum of its proper divisors (570872652).

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

256558260 is a wasteful number, since it uses less digits than its factorization.

256558260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813 (or 4811 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The square root of 256558260 is about 16017.4361244239. The cubic root of 256558260 is about 635.4216390808.

The spelling of 256558260 in words is "two hundred fifty-six million, five hundred fifty-eight thousand, two hundred sixty".