256521012 has 96 divisors (see below), whose sum is σ = 671182848. Its totient is φ = 75600000.

The previous prime is 256521011. The next prime is 256521017. The reversal of 256521012 is 210125652.

It is a happy number.

256521012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256521011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 946437 + ... + 946707.

It is an arithmetic number, because the mean of its divisors is an integer number (6991488).

Almost surely, 2^256521012 is an apocalyptic number.

256521012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256521012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335591424).

256521012 is an abundant number, since it is smaller than the sum of its proper divisors (414661836).

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

256521012 is a wasteful number, since it uses less digits than its factorization.

256521012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 256521012 is about 16016.2733493157. The cubic root of 256521012 is about 635.3908867016.

Adding to 256521012 its reverse (210125652), we get a palindrome (466646664).

The spelling of 256521012 in words is "two hundred fifty-six million, five hundred twenty-one thousand, twelve".