256722442 has 8 divisors (see below), whose sum is σ = 398362500. Its totient is φ = 123934944.

The previous prime is 256722409. The next prime is 256722449. The reversal of 256722442 is 244227652.

It can be written as a sum of positive squares in 2 ways, for example, as 255008961 + 1713481 = 15969^2 + 1309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 256722398 and 256722407.

It is not an unprimeable number, because it can be changed into a prime (256722449) 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, 2213067 + ... + 2213182.

Almost surely, 2^256722442 is an apocalyptic number.

256722442 is a deficient number, since it is larger than the sum of its proper divisors (141640058).

256722442 is a wasteful number, since it uses less digits than its factorization.

256722442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426280.

The product of its digits is 53760, while the sum is 34.

The square root of 256722442 is about 16022.5604071259. The cubic root of 256722442 is about 635.5571541740.

The spelling of 256722442 in words is "two hundred fifty-six million, seven hundred twenty-two thousand, four hundred forty-two".