256186778 has 16 divisors (see below), whose sum is σ = 394377984. Its totient is φ = 124739040.

The previous prime is 256186771. The next prime is 256186781. The reversal of 256186778 is 877681652.

256186778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256186771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47201 + ... + 52347.

It is an arithmetic number, because the mean of its divisors is an integer number (24648624).

Almost surely, 2^256186778 is an apocalyptic number.

256186778 is a deficient number, since it is larger than the sum of its proper divisors (138191206).

256186778 is a wasteful number, since it uses less digits than its factorization.

256186778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5797.

The product of its digits is 1128960, while the sum is 50.

The square root of 256186778 is about 16005.8357482513. The cubic root of 256186778 is about 635.1148059519.

The spelling of 256186778 in words is "two hundred fifty-six million, one hundred eighty-six thousand, seven hundred seventy-eight".