256621046 has 16 divisors (see below), whose sum is σ = 420189120. Its totient is φ = 116572680.

The previous prime is 256620983. The next prime is 256621073. The reversal of 256621046 is 640126652.

It is a super-2 number, since 2×256621046² = 131708722500268232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48965 + ... + 53951.

It is an arithmetic number, because the mean of its divisors is an integer number (26261820).

Almost surely, 2^256621046 is an apocalyptic number.

256621046 is a deficient number, since it is larger than the sum of its proper divisors (163568074).

256621046 is a wasteful number, since it uses less digits than its factorization.

256621046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7339.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 256621046 is about 16019.3959311829. The cubic root of 256621046 is about 635.4734691914.

Adding to 256621046 its reverse (640126652), we get a palindrome (896747698).

The spelling of 256621046 in words is "two hundred fifty-six million, six hundred twenty-one thousand, forty-six".