256136240 has 40 divisors (see below), whose sum is σ = 597513840. Its totient is φ = 102110976.

The previous prime is 256136219. The next prime is 256136261. The reversal of 256136240 is 42631652.

It is an interprime number because it is at equal distance from previous prime (256136219) and next prime (256136261).

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 19346 + ... + 29774.

It is an arithmetic number, because the mean of its divisors is an integer number (14937846).

Almost surely, 2^256136240 is an apocalyptic number.

256136240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256136240 is an abundant number, since it is smaller than the sum of its proper divisors (341377600).

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

256136240 is a wasteful number, since it uses less digits than its factorization.

256136240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749 (or 10743 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 256136240 is about 16004.2569337036. The cubic root of 256136240 is about 635.0730401444.

Adding to 256136240 its reverse (42631652), we get a palindrome (298767892).

The spelling of 256136240 in words is "two hundred fifty-six million, one hundred thirty-six thousand, two hundred forty".