256763 has 4 divisors (see below), whose sum is σ = 276528. Its totient is φ = 237000.

The previous prime is 256757. The next prime is 256771. The reversal of 256763 is 367652.

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 256763 - 2⁶ = 256699 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9863 + ... + 9888.

It is an arithmetic number, because the mean of its divisors is an integer number (69132).

2²⁵⁶⁷⁶³ is an apocalyptic number.

256763 is a deficient number, since it is larger than the sum of its proper divisors (19765).

256763 is a wasteful number, since it uses less digits than its factorization.

256763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19764.

The product of its digits is 7560, while the sum is 29.

The square root of 256763 is about 506.7178702197. The cubic root of 256763 is about 63.5590621667.

Subtracting 256763 from its reverse (367652), we obtain a square (110889 = 333²).

It can be divided in two parts, 25676 and 3, that multiplied together give a triangular number (77028 = T₃₉₂).

The spelling of 256763 in words is "two hundred fifty-six thousand, seven hundred sixty-three".