728817 has 8 divisors (see below), whose sum is σ = 975840. Its totient is φ = 483840.

The previous prime is 728813. The next prime is 728831. The reversal of 728817 is 718827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728817 - 2² = 728813 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (728813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 817 + ... + 1457.

It is an arithmetic number, because the mean of its divisors is an integer number (121980).

2⁷²⁸⁸¹⁷ is an apocalyptic number.

It is an amenable number.

728817 is a deficient number, since it is larger than the sum of its proper divisors (247023).

728817 is a wasteful number, since it uses less digits than its factorization.

728817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its digits is 6272, while the sum is 33.

The square root of 728817 is about 853.7077954429. The cubic root of 728817 is about 89.9924685056.

The spelling of 728817 in words is "seven hundred twenty-eight thousand, eight hundred seventeen".