256409744 has 10 divisors (see below), whose sum is σ = 496793910. Its totient is φ = 128204864.

The previous prime is 256409723. The next prime is 256409749. The reversal of 256409744 is 447904652.

It can be written as a sum of positive squares in only one way, i.e., 256384144 + 25600 = 16012^2 + 160^2 .

It is not an unprimeable number, because it can be changed into a prime (256409749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8012789 + ... + 8012820.

It is an arithmetic number, because the mean of its divisors is an integer number (49679391).

Almost surely, 2^256409744 is an apocalyptic number.

It is an amenable number.

256409744 is a deficient number, since it is larger than the sum of its proper divisors (240384166).

256409744 is a wasteful number, since it uses less digits than its factorization.

256409744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16025617 (or 16025611 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 256409744 is about 16012.7993804956. The cubic root of 256409744 is about 635.2990048227.

The spelling of 256409744 in words is "two hundred fifty-six million, four hundred nine thousand, seven hundred forty-four".