256043136 has 128 divisors (see below), whose sum is σ = 711682560. Its totient is φ = 81469440.

The previous prime is 256043083. The next prime is 256043141. The reversal of 256043136 is 631340652.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

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, 1630770 + ... + 1630926.

It is an arithmetic number, because the mean of its divisors is an integer number (5560020).

Almost surely, 2^256043136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256043136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355841280).

256043136 is an abundant number, since it is smaller than the sum of its proper divisors (455639424).

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

256043136 is a wasteful number, since it uses less digits than its factorization.

256043136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 256043136 is about 16001.3479432203. The cubic root of 256043136 is about 634.9960823947.

Adding to 256043136 its reverse (631340652), we get a palindrome (887383788).

The spelling of 256043136 in words is "two hundred fifty-six million, forty-three thousand, one hundred thirty-six".