256443144 has 16 divisors (see below), whose sum is σ = 641107920. Its totient is φ = 85481040.

The previous prime is 256443137. The next prime is 256443157. The reversal of 256443144 is 441344652.

It is a happy number.

It is a super-2 number, since 2×256443144² = 131526172209209472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5342542 + ... + 5342589.

It is an arithmetic number, because the mean of its divisors is an integer number (40069245).

Almost surely, 2^256443144 is an apocalyptic number.

256443144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256443144 is an abundant number, since it is smaller than the sum of its proper divisors (384664776).

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

256443144 is a wasteful number, since it uses less digits than its factorization.

256443144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10685140 (or 10685136 counting only the distinct ones).

The product of its digits is 46080, while the sum is 33.

The square root of 256443144 is about 16013.8422622430. The cubic root of 256443144 is about 635.3265883629.

Adding to 256443144 its reverse (441344652), we get a palindrome (697787796).

The spelling of 256443144 in words is "two hundred fifty-six million, four hundred forty-three thousand, one hundred forty-four".