256735 has 4 divisors (see below), whose sum is σ = 308088. Its totient is φ = 205384.

The previous prime is 256723. The next prime is 256757. The reversal of 256735 is 537652.

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

It is a cyclic number.

It is not a de Polignac number, because 256735 - 2¹³ = 248543 is a prime.

It is a Duffinian number.

256735 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25669 + ... + 25678.

It is an arithmetic number, because the mean of its divisors is an integer number (77022).

2²⁵⁶⁷³⁵ is an apocalyptic number.

256735 is a deficient number, since it is larger than the sum of its proper divisors (51353).

256735 is an equidigital number, since it uses as much as digits as its factorization.

256735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51352.

The product of its digits is 6300, while the sum is 28.

The square root of 256735 is about 506.6902406796. The cubic root of 256735 is about 63.5567517112.

The spelling of 256735 in words is "two hundred fifty-six thousand, seven hundred thirty-five".