256345730 has 16 divisors (see below), whose sum is σ = 462633984. Its totient is φ = 102269040.

The previous prime is 256345697. The next prime is 256345751. The reversal of 256345730 is 37543652.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29636 + ... + 37295.

It is an arithmetic number, because the mean of its divisors is an integer number (28914624).

Almost surely, 2^256345730 is an apocalyptic number.

256345730 is a deficient number, since it is larger than the sum of its proper divisors (206288254).

256345730 is a wasteful number, since it uses less digits than its factorization.

256345730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67321.

The product of its (nonzero) digits is 75600, while the sum is 35.

The square root of 256345730 is about 16010.8004172184. The cubic root of 256345730 is about 635.2461318771.

The spelling of 256345730 in words is "two hundred fifty-six million, three hundred forty-five thousand, seven hundred thirty".