256008433 has 4 divisors (see below), whose sum is σ = 264836340. Its totient is φ = 247180528.

The previous prime is 256008419. The next prime is 256008443. The reversal of 256008433 is 334800652.

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 199713424 + 56295009 = 14132^2 + 7503^2 .

It is a cyclic number.

It is not a de Polignac number, because 256008433 - 2¹⁷ = 255877361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256008395 and 256008404.

It is not an unprimeable number, because it can be changed into a prime (256008443) 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, 4413910 + ... + 4413967.

It is an arithmetic number, because the mean of its divisors is an integer number (66209085).

Almost surely, 2^256008433 is an apocalyptic number.

It is an amenable number.

256008433 is a deficient number, since it is larger than the sum of its proper divisors (8827907).

256008433 is an equidigital number, since it uses as much as digits as its factorization.

256008433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8827906.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 256008433 is about 16000.2635290798. The cubic root of 256008433 is about 634.9673928738.

The spelling of 256008433 in words is "two hundred fifty-six million, eight thousand, four hundred thirty-three".