256748750784 has 140 divisors (see below), whose sum is σ = 761433497704. Its totient is φ = 85543589376.

The previous prime is 256748750779. The next prime is 256748750821. The reversal of 256748750784 is 487057847652.

It is a happy number.

256748750784 is a `hidden beast` number, since 2 + 5 + 6 + 7 + 48 + 7 + 507 + 84 = 666.

It is a super-2 number, since 2×256748750784² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12623247 + ... + 12643569.

Almost surely, 2^256748750784 is an apocalyptic number.

256748750784 is a gapful number since it is divisible by the number (24) 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 256748750784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (380716748852).

256748750784 is an abundant number, since it is smaller than the sum of its proper divisors (504684746920).

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

256748750784 is a wasteful number, since it uses less digits than its factorization.

256748750784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22784 (or 22765 counting only the distinct ones).

The product of its (nonzero) digits is 105369600, while the sum is 63.

The spelling of 256748750784 in words is "two hundred fifty-six billion, seven hundred forty-eight million, seven hundred fifty thousand, seven hundred eighty-four".