728449 has 4 divisors (see below), whose sum is σ = 731860. Its totient is φ = 725040.

The previous prime is 728437. The next prime is 728471. The reversal of 728449 is 944827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 944827 = 13 ⋅72679.

It can be written as a sum of positive squares in 2 ways, for example, as 368449 + 360000 = 607^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 728449 - 2⁵ = 728417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728489) 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, 1362 + ... + 1819.

It is an arithmetic number, because the mean of its divisors is an integer number (182965).

2⁷²⁸⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

728449 is a deficient number, since it is larger than the sum of its proper divisors (3411).

728449 is a wasteful number, since it uses less digits than its factorization.

728449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410.

The product of its digits is 16128, while the sum is 34.

The square root of 728449 is about 853.4922378089. The cubic root of 728449 is about 89.9773193877.

The spelling of 728449 in words is "seven hundred twenty-eight thousand, four hundred forty-nine".