256539778 has 8 divisors (see below), whose sum is σ = 419792400. Its totient is φ = 116608980.

The previous prime is 256539743. The next prime is 256539791. The reversal of 256539778 is 877935652.

256539778 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5830428 + ... + 5830471.

It is an arithmetic number, because the mean of its divisors is an integer number (52474050).

Almost surely, 2^256539778 is an apocalyptic number.

256539778 is a deficient number, since it is larger than the sum of its proper divisors (163252622).

256539778 is a wasteful number, since it uses less digits than its factorization.

256539778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11660912.

The product of its digits is 3175200, while the sum is 52.

The square root of 256539778 is about 16016.8591802513. The cubic root of 256539778 is about 635.4063805001.

The spelling of 256539778 in words is "two hundred fifty-six million, five hundred thirty-nine thousand, seven hundred seventy-eight".