256358642 has 4 divisors (see below), whose sum is σ = 384537966. Its totient is φ = 128179320.

The previous prime is 256358639. The next prime is 256358651. The reversal of 256358642 is 246853652.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 212255761 + 44102881 = 14569^2 + 6641^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256358642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64089659 + ... + 64089662.

Almost surely, 2^256358642 is an apocalyptic number.

256358642 is a deficient number, since it is larger than the sum of its proper divisors (128179324).

256358642 is a wasteful number, since it uses less digits than its factorization.

256358642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128179323.

The product of its digits is 345600, while the sum is 41.

The square root of 256358642 is about 16011.2036399516. The cubic root of 256358642 is about 635.2567973696.

The spelling of 256358642 in words is "two hundred fifty-six million, three hundred fifty-eight thousand, six hundred forty-two".