256511144 has 32 divisors (see below), whose sum is σ = 486588000. Its totient is φ = 126764352.

The previous prime is 256511053. The next prime is 256511221. The reversal of 256511144 is 441115652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298187 + ... + 299045.

It is an arithmetic number, because the mean of its divisors is an integer number (15205875).

Almost surely, 2^256511144 is an apocalyptic number.

It is an amenable number.

256511144 is a deficient number, since it is larger than the sum of its proper divisors (230076856).

256511144 is a wasteful number, since it uses less digits than its factorization.

256511144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257 (or 1253 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 256511144 is about 16015.9652846777. The cubic root of 256511144 is about 635.3827390679.

Adding to 256511144 its reverse (441115652), we get a palindrome (697626796).

The spelling of 256511144 in words is "two hundred fifty-six million, five hundred eleven thousand, one hundred forty-four".