728678849 has 4 divisors (see below), whose sum is σ = 728967936. Its totient is φ = 728389764.

The previous prime is 728678831. The next prime is 728678869. The reversal of 728678849 is 948876827.

728678849 is digitally balanced in base 2, 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 948876827 = 12329 ⋅76963.

It is a cyclic number.

It is not a de Polignac number, because 728678849 - 2⁸ = 728678593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728678809) 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, 140729 + ... + 145814.

It is an arithmetic number, because the mean of its divisors is an integer number (182241984).

Almost surely, 2^728678849 is an apocalyptic number.

It is an amenable number.

728678849 is a deficient number, since it is larger than the sum of its proper divisors (289087).

728678849 is a wasteful number, since it uses less digits than its factorization.

728678849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289086.

The product of its digits is 10838016, while the sum is 59.

The square root of 728678849 is about 26994.0521041210. The cubic root of 728678849 is about 899.8678196827.

The spelling of 728678849 in words is "seven hundred twenty-eight million, six hundred seventy-eight thousand, eight hundred forty-nine".