256765438 has 4 divisors (see below), whose sum is σ = 385148160. Its totient is φ = 128382718.

The previous prime is 256765423. The next prime is 256765441. The reversal of 256765438 is 834567652.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64191358 + ... + 64191361.

It is an arithmetic number, because the mean of its divisors is an integer number (96287040).

Almost surely, 2^256765438 is an apocalyptic number.

256765438 is a deficient number, since it is larger than the sum of its proper divisors (128382722).

256765438 is a wasteful number, since it uses less digits than its factorization.

256765438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128382721.

The product of its digits is 1209600, while the sum is 46.

The square root of 256765438 is about 16023.9020840743. The cubic root of 256765438 is about 635.5926333343.

The spelling of 256765438 in words is "two hundred fifty-six million, seven hundred sixty-five thousand, four hundred thirty-eight".