256299728238 has 48 divisors (see below), whose sum is σ = 559078399152. Its totient is φ = 84855600000.

The previous prime is 256299728231. The next prime is 256299728257. The reversal of 256299728238 is 832827992652.

256299728238 is a `hidden beast` number, since 256 + 299 + 72 + 8 + 23 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256299728231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2593738 + ... + 2690738.

It is an arithmetic number, because the mean of its divisors is an integer number (11647466649).

Almost surely, 2^256299728238 is an apocalyptic number.

256299728238 is an abundant number, since it is smaller than the sum of its proper divisors (302778670914).

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

256299728238 is a wasteful number, since it uses less digits than its factorization.

256299728238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98001 (or 97998 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 256299728238 in words is "two hundred fifty-six billion, two hundred ninety-nine million, seven hundred twenty-eight thousand, two hundred thirty-eight".