256204778 has 16 divisors (see below), whose sum is σ = 410235840. Its totient is φ = 119649600.

The previous prime is 256204771. The next prime is 256204783. The reversal of 256204778 is 877402652.

It is not an unprimeable number, because it can be changed into a prime (256204771) 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, 44783 + ... + 50178.

It is an arithmetic number, because the mean of its divisors is an integer number (25639740).

Almost surely, 2^256204778 is an apocalyptic number.

256204778 is a deficient number, since it is larger than the sum of its proper divisors (154031062).

256204778 is a wasteful number, since it uses less digits than its factorization.

256204778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95053.

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 256204778 is about 16006.3980332866. The cubic root of 256204778 is about 635.1296802542.

The spelling of 256204778 in words is "two hundred fifty-six million, two hundred four thousand, seven hundred seventy-eight".