256381916 has 36 divisors (see below), whose sum is σ = 525483000. Its totient is φ = 109128096.

The previous prime is 256381903. The next prime is 256381921. The reversal of 256381916 is 619183652.

256381916 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 11 ways as a sum of consecutive naturals, for example, 24815 + ... + 33593.

It is an arithmetic number, because the mean of its divisors is an integer number (14596750).

Almost surely, 2^256381916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256381916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262741500).

256381916 is an abundant number, since it is smaller than the sum of its proper divisors (269101084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256381916 is a wasteful number, since it uses less digits than its factorization.

256381916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8946 (or 8937 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 256381916 is about 16011.9304270285. The cubic root of 256381916 is about 635.2760211143.

The spelling of 256381916 in words is "two hundred fifty-six million, three hundred eighty-one thousand, nine hundred sixteen".