256206578 has 16 divisors (see below), whose sum is σ = 389181024. Its totient is φ = 126487680.

The previous prime is 256206563. The next prime is 256206589. The reversal of 256206578 is 875602652.

It is a super-2 number, since 2×256206578² = 131283621220940168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69026 + ... + 72642.

It is an arithmetic number, because the mean of its divisors is an integer number (24323814).

Almost surely, 2^256206578 is an apocalyptic number.

256206578 is a deficient number, since it is larger than the sum of its proper divisors (132974446).

256206578 is a wasteful number, since it uses less digits than its factorization.

256206578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 256206578 is about 16006.4542607037. The cubic root of 256206578 is about 635.1311676461.

The spelling of 256206578 in words is "two hundred fifty-six million, two hundred six thousand, five hundred seventy-eight".