256784753 has 4 divisors (see below), whose sum is σ = 270299760. Its totient is φ = 243269748.

The previous prime is 256784743. The next prime is 256784771. The reversal of 256784753 is 357487652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256784753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256784698 and 256784707.

It is not an unprimeable number, because it can be changed into a prime (256784743) 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, 6757475 + ... + 6757512.

It is an arithmetic number, because the mean of its divisors is an integer number (67574940).

Almost surely, 2^256784753 is an apocalyptic number.

It is an amenable number.

256784753 is a deficient number, since it is larger than the sum of its proper divisors (13515007).

256784753 is a wasteful number, since it uses less digits than its factorization.

256784753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13515006.

The product of its digits is 1411200, while the sum is 47.

The square root of 256784753 is about 16024.5047661386. The cubic root of 256784753 is about 635.6085702714.

The spelling of 256784753 in words is "two hundred fifty-six million, seven hundred eighty-four thousand, seven hundred fifty-three".