256778812 has 18 divisors (see below), whose sum is σ = 477353072. Its totient is φ = 120836544.

The previous prime is 256778807. The next prime is 256778833. The reversal of 256778812 is 218877652.

256778812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109908 + ... + 112219.

Almost surely, 2^256778812 is an apocalyptic number.

It is an amenable number.

256778812 is a deficient number, since it is larger than the sum of its proper divisors (220574260).

256778812 is a wasteful number, since it uses less digits than its factorization.

256778812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222165 (or 222146 counting only the distinct ones).

The product of its digits is 376320, while the sum is 46.

The square root of 256778812 is about 16024.3193927230. The cubic root of 256778812 is about 635.6036683972.

The spelling of 256778812 in words is "two hundred fifty-six million, seven hundred seventy-eight thousand, eight hundred twelve".