728985 has 16 divisors (see below), whose sum is σ = 1217664. Its totient is φ = 371712.

The previous prime is 728971. The next prime is 728993. The reversal of 728985 is 589827.

It is not a de Polignac number, because 728985 - 2⁴ = 728969 is a prime.

728985 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712 + ... + 1401.

It is an arithmetic number, because the mean of its divisors is an integer number (76104).

2⁷²⁸⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

728985 is a deficient number, since it is larger than the sum of its proper divisors (488679).

728985 is a wasteful number, since it uses less digits than its factorization.

728985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144.

The product of its digits is 40320, while the sum is 39.

The square root of 728985 is about 853.8061840957. The cubic root of 728985 is about 89.9993827118. Note that the first 3 decimals are identical.

The spelling of 728985 in words is "seven hundred twenty-eight thousand, nine hundred eighty-five".