256730842 has 8 divisors (see below), whose sum is σ = 385398432. Its totient is φ = 128264700.

The previous prime is 256730839. The next prime is 256730849. The reversal of 256730842 is 248037652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (256730849) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 47134 + ... + 52297.

It is an arithmetic number, because the mean of its divisors is an integer number (48174804).

Almost surely, 2^256730842 is an apocalyptic number.

256730842 is a deficient number, since it is larger than the sum of its proper divisors (128667590).

256730842 is a wasteful number, since it uses less digits than its factorization.

256730842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100724.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 256730842 is about 16022.8225353712. The cubic root of 256730842 is about 635.5640859429.

The spelling of 256730842 in words is "two hundred fifty-six million, seven hundred thirty thousand, eight hundred forty-two".