256136260 has 48 divisors (see below), whose sum is σ = 561093120. Its totient is φ = 98104320.

The previous prime is 256136219. The next prime is 256136261. The reversal of 256136260 is 62631652.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (256136261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58011 + ... + 62269.

It is an arithmetic number, because the mean of its divisors is an integer number (11689440).

Almost surely, 2^256136260 is an apocalyptic number.

256136260 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 256136260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280546560).

256136260 is an abundant number, since it is smaller than the sum of its proper divisors (304956860).

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

256136260 is a wasteful number, since it uses less digits than its factorization.

256136260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396 (or 4394 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 256136260 is about 16004.2575585374. The cubic root of 256136260 is about 635.0730566740.

The spelling of 256136260 in words is "two hundred fifty-six million, one hundred thirty-six thousand, two hundred sixty".