256730642 has 16 divisors (see below), whose sum is σ = 452005440. Its totient is φ = 107053488.

The previous prime is 256730611. The next prime is 256730647. The reversal of 256730642 is 246037652.

256730642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256730647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247292 + ... + 248327.

It is an arithmetic number, because the mean of its divisors is an integer number (28250340).

Almost surely, 2^256730642 is an apocalyptic number.

256730642 is a deficient number, since it is larger than the sum of its proper divisors (195274798).

256730642 is a wasteful number, since it uses less digits than its factorization.

256730642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495665.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 256730642 is about 16022.8162942724. The cubic root of 256730642 is about 635.5639209025.

The spelling of 256730642 in words is "two hundred fifty-six million, seven hundred thirty thousand, six hundred forty-two".