728933605 has 4 divisors (see below), whose sum is σ = 874720332. Its totient is φ = 583146880.

The previous prime is 728933567. The next prime is 728933609. The reversal of 728933605 is 506339827.

728933605 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506339827 = 7 ⋅72334261.

It can be written as a sum of positive squares in 2 ways, for example, as 388641796 + 340291809 = 19714^2 + 18447^2 .

It is not a de Polignac number, because 728933605 - 2⁷ = 728933477 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 (728933609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72893356 + ... + 72893365.

It is an arithmetic number, because the mean of its divisors is an integer number (218680083).

Almost surely, 2^728933605 is an apocalyptic number.

It is an amenable number.

728933605 is a deficient number, since it is larger than the sum of its proper divisors (145786727).

728933605 is a wasteful number, since it uses less digits than its factorization.

728933605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145786726.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 728933605 is about 26998.7704349661. The cubic root of 728933605 is about 899.9726761252.

The spelling of 728933605 in words is "seven hundred twenty-eight million, nine hundred thirty-three thousand, six hundred five".