256000440 has 64 divisors (see below), whose sum is σ = 778844160. Its totient is φ = 67303040.

The previous prime is 256000439. The next prime is 256000463. The reversal of 256000440 is 44000652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6504 + ... + 23543.

It is an arithmetic number, because the mean of its divisors is an integer number (12169440).

Almost surely, 2^256000440 is an apocalyptic number.

256000440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256000440 is an abundant number, since it is smaller than the sum of its proper divisors (522843720).

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

256000440 is a wasteful number, since it uses less digits than its factorization.

256000440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30132 (or 30128 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 256000440 is about 16000.0137499941. The cubic root of 256000440 is about 634.9607845665.

The spelling of 256000440 in words is "two hundred fifty-six million, four hundred forty", and thus it is an aban number.