256433644 has 24 divisors (see below), whose sum is σ = 476633808. Its totient is φ = 120299520.

The previous prime is 256433629. The next prime is 256433657. The reversal of 256433644 is 446334652.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16812 + ... + 28204.

It is an arithmetic number, because the mean of its divisors is an integer number (19859742).

Almost surely, 2^256433644 is an apocalyptic number.

It is an amenable number.

256433644 is a deficient number, since it is larger than the sum of its proper divisors (220200164).

256433644 is a wasteful number, since it uses less digits than its factorization.

256433644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11745 (or 11743 counting only the distinct ones).

The product of its digits is 207360, while the sum is 37.

The square root of 256433644 is about 16013.5456411127. The cubic root of 256433644 is about 635.3187429889.

The spelling of 256433644 in words is "two hundred fifty-six million, four hundred thirty-three thousand, six hundred forty-four".