256778782 has 8 divisors (see below), whose sum is σ = 414796536. Its totient is φ = 118513272.

The previous prime is 256778759. The next prime is 256778783. The reversal of 256778782 is 287877652.

256778782 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256778783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4938028 + ... + 4938079.

It is an arithmetic number, because the mean of its divisors is an integer number (51849567).

Almost surely, 2^256778782 is an apocalyptic number.

256778782 is a deficient number, since it is larger than the sum of its proper divisors (158017754).

256778782 is a wasteful number, since it uses less digits than its factorization.

256778782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9876122.

The product of its digits is 2634240, while the sum is 52.

The square root of 256778782 is about 16024.3184566458. The cubic root of 256778782 is about 635.6036436443.

The spelling of 256778782 in words is "two hundred fifty-six million, seven hundred seventy-eight thousand, seven hundred eighty-two".