728473 has 4 divisors (see below), whose sum is σ = 740880. Its totient is φ = 716068.

The previous prime is 728471. The next prime is 728477. The reversal of 728473 is 374827.

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: 374827 = 59 ⋅6353.

It is a cyclic number.

It is not a de Polignac number, because 728473 - 2¹ = 728471 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

728473 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (728471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6115 + ... + 6232.

It is an arithmetic number, because the mean of its divisors is an integer number (185220).

2⁷²⁸⁴⁷³ is an apocalyptic number.

It is an amenable number.

728473 is a deficient number, since it is larger than the sum of its proper divisors (12407).

728473 is a wasteful number, since it uses less digits than its factorization.

728473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12406.

The product of its digits is 9408, while the sum is 31.

The square root of 728473 is about 853.5062975749. The cubic root of 728473 is about 89.9783075291.

Adding to 728473 its product of digits (9408), we get a square (737881 = 859²).

The spelling of 728473 in words is "seven hundred twenty-eight thousand, four hundred seventy-three".