256678018 has 4 divisors (see below), whose sum is σ = 385017030. Its totient is φ = 128339008.

The previous prime is 256678003. The next prime is 256678021. The reversal of 256678018 is 810876652.

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., 215884249 + 40793769 = 14693^2 + 6387^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64169503 + ... + 64169506.

Almost surely, 2^256678018 is an apocalyptic number.

256678018 is a deficient number, since it is larger than the sum of its proper divisors (128339012).

256678018 is a wasteful number, since it uses less digits than its factorization.

256678018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128339011.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 256678018 is about 16021.1740518602. The cubic root of 256678018 is about 635.5204925048.

The spelling of 256678018 in words is "two hundred fifty-six million, six hundred seventy-eight thousand, eighteen".