256021444 has 12 divisors (see below), whose sum is σ = 512042944. Its totient is φ = 109723464.

The previous prime is 256021433. The next prime is 256021499. The reversal of 256021444 is 444120652.

256021444 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 9143623 = 256021444 / (2 + 5 + 6 + 0 + 2 + 1 + 4 + 4 + 4).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4571784 + ... + 4571839.

Almost surely, 2^256021444 is an apocalyptic number.

It is an amenable number.

256021444 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.

256021444 is a wasteful number, since it uses less digits than its factorization.

256021444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9143634 (or 9143632 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 256021444 is about 16000.6701109672. The cubic root of 256021444 is about 634.9781495778.

The spelling of 256021444 in words is "two hundred fifty-six million, twenty-one thousand, four hundred forty-four".