256366678 has 4 divisors (see below), whose sum is σ = 384550020. Its totient is φ = 128183338.

The previous prime is 256366657. The next prime is 256366679. The reversal of 256366678 is 876663652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256366679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64091668 + ... + 64091671.

It is an arithmetic number, because the mean of its divisors is an integer number (96137505).

Almost surely, 2^256366678 is an apocalyptic number.

256366678 is a deficient number, since it is larger than the sum of its proper divisors (128183342).

256366678 is a wasteful number, since it uses less digits than its factorization.

256366678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128183341.

The product of its digits is 2177280, while the sum is 49.

The square root of 256366678 is about 16011.4545872635. The cubic root of 256366678 is about 635.2634350371.

The spelling of 256366678 in words is "two hundred fifty-six million, three hundred sixty-six thousand, six hundred seventy-eight".