256028549 has 4 divisors (see below), whose sum is σ = 292604064. Its totient is φ = 219453036.

The previous prime is 256028543. The next prime is 256028623. The reversal of 256028549 is 945820652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256028549 - 2⁸ = 256028293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256028543) 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, 18287747 + ... + 18287760.

It is an arithmetic number, because the mean of its divisors is an integer number (73151016).

Almost surely, 2^256028549 is an apocalyptic number.

It is an amenable number.

256028549 is a deficient number, since it is larger than the sum of its proper divisors (36575515).

256028549 is an equidigital number, since it uses as much as digits as its factorization.

256028549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36575514.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 256028549 is about 16000.8921313782. The cubic root of 256028549 is about 634.9840234061.

The spelling of 256028549 in words is "two hundred fifty-six million, twenty-eight thousand, five hundred forty-nine".