256006644 has 12 divisors (see below), whose sum is σ = 597348864. Its totient is φ = 85335544.

The previous prime is 256006643. The next prime is 256006651. The reversal of 256006644 is 446600652.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256006643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10666932 + ... + 10666955.

It is an arithmetic number, because the mean of its divisors is an integer number (49779072).

Almost surely, 2^256006644 is an apocalyptic number.

It is an amenable number.

256006644 is an abundant number, since it is smaller than the sum of its proper divisors (341342220).

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

256006644 is a wasteful number, since it uses less digits than its factorization.

256006644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21333894 (or 21333892 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 256006644 is about 16000.2076236529. The cubic root of 256006644 is about 634.9659138088.

The spelling of 256006644 in words is "two hundred fifty-six million, six thousand, six hundred forty-four".