256782737838 has 64 divisors (see below), whose sum is σ = 564361528320. Its totient is φ = 77244451200.

The previous prime is 256782737833. The next prime is 256782737857. The reversal of 256782737838 is 838737287652.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256782737831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4928508 + ... + 4980336.

It is an arithmetic number, because the mean of its divisors is an integer number (8818148880).

Almost surely, 2^256782737838 is an apocalyptic number.

256782737838 is an abundant number, since it is smaller than the sum of its proper divisors (307578790482).

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

256782737838 is a wasteful number, since it uses less digits than its factorization.

256782737838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52393.

The product of its digits is 189665280, while the sum is 66.

The spelling of 256782737838 in words is "two hundred fifty-six billion, seven hundred eighty-two million, seven hundred thirty-seven thousand, eight hundred thirty-eight".