728615 has 4 divisors (see below), whose sum is σ = 874344. Its totient is φ = 582888.

The previous prime is 728579. The next prime is 728627. The reversal of 728615 is 516827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 516827 = 257 ⋅2011.

It is a cyclic number.

It is not a de Polignac number, because 728615 - 2⁶ = 728551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 72857 + ... + 72866.

It is an arithmetic number, because the mean of its divisors is an integer number (218586).

2⁷²⁸⁶¹⁵ is an apocalyptic number.

728615 is a deficient number, since it is larger than the sum of its proper divisors (145729).

728615 is a wasteful number, since it uses less digits than its factorization.

728615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145728.

The product of its digits is 3360, while the sum is 29.

The square root of 728615 is about 853.5894797852. The cubic root of 728615 is about 89.9841535887.

The spelling of 728615 in words is "seven hundred twenty-eight thousand, six hundred fifteen".