256427191488 has 224 divisors, whose sum is σ = 750349910016. Its totient is φ = 76797407232.

The previous prime is 256427191483. The next prime is 256427191507. The reversal of 256427191488 is 884191724652.

It is not an unprimeable number, because it can be changed into a prime (256427191483) 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, 16792945 + ... + 16808207.

It is an arithmetic number, because the mean of its divisors is an integer number (3349776384).

Almost surely, 2^256427191488 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 256427191488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375174955008).

256427191488 is an abundant number, since it is smaller than the sum of its proper divisors (493922718528).

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

256427191488 is a wasteful number, since it uses less digits than its factorization.

256427191488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15471 (or 15461 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 57.

The spelling of 256427191488 in words is "two hundred fifty-six billion, four hundred twenty-seven million, one hundred ninety-one thousand, four hundred eighty-eight".