256005445 has 8 divisors (see below), whose sum is σ = 314351136. Its totient is φ = 200041296.

The previous prime is 256005443. The next prime is 256005467. The reversal of 256005445 is 544500652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256005445 - 2¹ = 256005443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256005443) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 595147 + ... + 595576.

It is an arithmetic number, because the mean of its divisors is an integer number (39293892).

Almost surely, 2^256005445 is an apocalyptic number.

It is an amenable number.

256005445 is a deficient number, since it is larger than the sum of its proper divisors (58345691).

256005445 is a wasteful number, since it uses less digits than its factorization.

256005445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190771.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 256005445 is about 16000.1701553452. The cubic root of 256005445 is about 634.9649225255.

The spelling of 256005445 in words is "two hundred fifty-six million, five thousand, four hundred forty-five".