728815 has 8 divisors (see below), whose sum is σ = 887328. Its totient is φ = 574560.

The previous prime is 728813. The next prime is 728831. The reversal of 728815 is 518827.

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

It is not a de Polignac number, because 728815 - 2¹ = 728813 is a prime.

It is a Duffinian number.

728815 is a lucky number.

It is a congruent 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, 672 + ... + 1381.

It is an arithmetic number, because the mean of its divisors is an integer number (110916).

2⁷²⁸⁸¹⁵ is an apocalyptic number.

728815 is a deficient number, since it is larger than the sum of its proper divisors (158513).

728815 is a wasteful number, since it uses less digits than its factorization.

728815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129.

The product of its digits is 4480, while the sum is 31.

The square root of 728815 is about 853.7066240811. The cubic root of 728815 is about 89.9923861872.

The spelling of 728815 in words is "seven hundred twenty-eight thousand, eight hundred fifteen".