256128016 has 15 divisors (see below), whose sum is σ = 496372093. Its totient is φ = 128032000.

The previous prime is 256127917. The next prime is 256128017. The reversal of 256128016 is 610821652.

The square root of 256128016 is 16004.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10265616 + 245862400 = 3204^2 + 15680^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256128017) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 62016 + ... + 66016.

Almost surely, 2^256128016 is an apocalyptic number.

256128016 is the 16004-th square number.

It is an amenable number.

256128016 is a deficient number, since it is larger than the sum of its proper divisors (240244077).

256128016 is an frugal number, since it uses more digits than its factorization.

256128016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8010 (or 4003 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The cubic root of 256128016 is about 635.0662431151.

Adding to 256128016 its reverse (610821652), we get a palindrome (866949668).

The spelling of 256128016 in words is "two hundred fifty-six million, one hundred twenty-eight thousand, sixteen".