728003449 has 4 divisors (see below), whose sum is σ = 766319440. Its totient is φ = 689687460.

The previous prime is 728003387. The next prime is 728003467. The reversal of 728003449 is 944300827.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 944300827 = 31 ⋅30461317.

It is not a de Polignac number, because 728003449 - 2⁹ = 728002937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728003489) 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, 19157967 + ... + 19158004.

It is an arithmetic number, because the mean of its divisors is an integer number (191579860).

Almost surely, 2^728003449 is an apocalyptic number.

It is an amenable number.

728003449 is a deficient number, since it is larger than the sum of its proper divisors (38315991).

728003449 is a wasteful number, since it uses less digits than its factorization.

728003449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38315990.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 728003449 is about 26981.5390406107. The cubic root of 728003449 is about 899.5897096939.

The spelling of 728003449 in words is "seven hundred twenty-eight million, three thousand, four hundred forty-nine".