728015 has 4 divisors (see below), whose sum is σ = 873624. Its totient is φ = 582408.

The previous prime is 728003. The next prime is 728017. The reversal of 728015 is 510827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728015 - 2⁸ = 727759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72797 + ... + 72806.

It is an arithmetic number, because the mean of its divisors is an integer number (218406).

2⁷²⁸⁰¹⁵ is an apocalyptic number.

728015 is a deficient number, since it is larger than the sum of its proper divisors (145609).

728015 is a wasteful number, since it uses less digits than its factorization.

728015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145608.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 728015 is about 853.2379503984. The cubic root of 728015 is about 89.9594467504.

The spelling of 728015 in words is "seven hundred twenty-eight thousand, fifteen".