256496705 has 4 divisors (see below), whose sum is σ = 307796052. Its totient is φ = 205197360.

The previous prime is 256496701. The next prime is 256496707. The reversal of 256496705 is 507694652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 148669249 + 107827456 = 12193^2 + 10384^2 .

It is not a de Polignac number, because 256496705 - 2² = 256496701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256496701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25649666 + ... + 25649675.

It is an arithmetic number, because the mean of its divisors is an integer number (76949013).

Almost surely, 2^256496705 is an apocalyptic number.

It is an amenable number.

256496705 is a deficient number, since it is larger than the sum of its proper divisors (51299347).

256496705 is an equidigital number, since it uses as much as digits as its factorization.

256496705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51299346.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 256496705 is about 16015.5145093750. The cubic root of 256496705 is about 635.3708169563.

The spelling of 256496705 in words is "two hundred fifty-six million, four hundred ninety-six thousand, seven hundred five".