256336642 has 12 divisors (see below), whose sum is σ = 408454290. Its totient is φ = 120628736.

The previous prime is 256336621. The next prime is 256336649. The reversal of 256336642 is 246633652.

It can be written as a sum of positive squares in 3 ways, for example, as 248094001 + 8242641 = 15751^2 + 2871^2 .

It is not an unprimeable number, because it can be changed into a prime (256336649) 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 5 ways as a sum of consecutive naturals, for example, 221167 + ... + 222322.

Almost surely, 2^256336642 is an apocalyptic number.

256336642 is a deficient number, since it is larger than the sum of its proper divisors (152117648).

256336642 is a wasteful number, since it uses less digits than its factorization.

256336642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443525 (or 443508 counting only the distinct ones).

The product of its digits is 155520, while the sum is 37.

The square root of 256336642 is about 16010.5166062810. The cubic root of 256336642 is about 635.2386248474.

The spelling of 256336642 in words is "two hundred fifty-six million, three hundred thirty-six thousand, six hundred forty-two".