256276426440 has 32 divisors (see below), whose sum is σ = 768829279680. Its totient is φ = 68340380352.

The previous prime is 256276426409. The next prime is 256276426447. The reversal of 256276426440 is 44624672652.

It is a self number, because there is not a number n which added to its sum of digits gives 256276426440.

It is not an unprimeable number, because it can be changed into a prime (256276426447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1067818324 + ... + 1067818563.

It is an arithmetic number, because the mean of its divisors is an integer number (24025914990).

Almost surely, 2^256276426440 is an apocalyptic number.

256276426440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256276426440 is an abundant number, since it is smaller than the sum of its proper divisors (512552853240).

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

256276426440 is a wasteful number, since it uses less digits than its factorization.

256276426440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135636901 (or 2135636897 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 48.

The spelling of 256276426440 in words is "two hundred fifty-six billion, two hundred seventy-six million, four hundred twenty-six thousand, four hundred forty".