256242644 has 12 divisors (see below), whose sum is σ = 512485344. Its totient is φ = 109818264.

The previous prime is 256242643. The next prime is 256242647. The reversal of 256242644 is 446242652.

256242644 is an admirable number.

It is a super-2 number, since 2×256242644² = 131320585208221472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256242643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4575734 + ... + 4575789.

It is an arithmetic number, because the mean of its divisors is an integer number (42707112).

Almost surely, 2^256242644 is an apocalyptic number.

It is an amenable number.

256242644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256242644 is a wasteful number, since it uses less digits than its factorization.

256242644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9151534 (or 9151532 counting only the distinct ones).

The product of its digits is 92160, while the sum is 35.

The square root of 256242644 is about 16007.5808290947. The cubic root of 256242644 is about 635.1609685540.

The spelling of 256242644 in words is "two hundred fifty-six million, two hundred forty-two thousand, six hundred forty-four".