256730253 has 16 divisors (see below), whose sum is σ = 377213760. Its totient is φ = 154312704.

The previous prime is 256730231. The next prime is 256730267. The reversal of 256730253 is 352037652.

It is not a de Polignac number, because 256730253 - 2¹⁴ = 256713869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256732253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74868 + ... + 78221.

It is an arithmetic number, because the mean of its divisors is an integer number (23575860).

Almost surely, 2^256730253 is an apocalyptic number.

It is an amenable number.

256730253 is a deficient number, since it is larger than the sum of its proper divisors (120483507).

256730253 is a wasteful number, since it uses less digits than its factorization.

256730253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153148.

The product of its (nonzero) digits is 37800, while the sum is 33.

The square root of 256730253 is about 16022.8041553281. The cubic root of 256730253 is about 635.5635998988.

The spelling of 256730253 in words is "two hundred fifty-six million, seven hundred thirty thousand, two hundred fifty-three".