281728039 has 4 divisors (see below), whose sum is σ = 282307024. Its totient is φ = 281149056.

The previous prime is 281728021. The next prime is 281728079. The reversal of 281728039 is 930827182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281728039 - 2⁷ = 281727911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 281727992 and 281728010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281728079) 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 3 ways as a sum of consecutive naturals, for example, 288762 + ... + 289735.

It is an arithmetic number, because the mean of its divisors is an integer number (70576756).

Almost surely, 2^281728039 is an apocalyptic number.

281728039 is a deficient number, since it is larger than the sum of its proper divisors (578985).

281728039 is an equidigital number, since it uses as much as digits as its factorization.

281728039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578984.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 281728039 is about 16784.7561495543. The cubic root of 281728039 is about 655.5563433561.

The spelling of 281728039 in words is "two hundred eighty-one million, seven hundred twenty-eight thousand, thirty-nine".