256781122 has 48 divisors (see below), whose sum is σ = 440415360. Its totient is φ = 111555360.

The previous prime is 256781111. The next prime is 256781123. The reversal of 256781122 is 221187652.

It is a happy number.

256781122 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 (256781123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1074279 + ... + 1074517.

It is an arithmetic number, because the mean of its divisors is an integer number (9175320).

Almost surely, 2^256781122 is an apocalyptic number.

256781122 is a deficient number, since it is larger than the sum of its proper divisors (183634238).

256781122 is a wasteful number, since it uses less digits than its factorization.

256781122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 328 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 256781122 is about 16024.3914705052. The cubic root of 256781122 is about 635.6055743697.

The spelling of 256781122 in words is "two hundred fifty-six million, seven hundred eighty-one thousand, one hundred twenty-two".