728813615 has 4 divisors (see below), whose sum is σ = 874576344. Its totient is φ = 583050888.

The previous prime is 728813597. The next prime is 728813629. The reversal of 728813615 is 516318827.

728813615 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.

It is a cyclic number.

It is not a de Polignac number, because 728813615 - 2⁸ = 728813359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72881357 + ... + 72881366.

It is an arithmetic number, because the mean of its divisors is an integer number (218644086).

Almost surely, 2^728813615 is an apocalyptic number.

728813615 is a deficient number, since it is larger than the sum of its proper divisors (145762729).

728813615 is a wasteful number, since it uses less digits than its factorization.

728813615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145762728.

The product of its digits is 80640, while the sum is 41.

The square root of 728813615 is about 26996.5482052799. The cubic root of 728813615 is about 899.9232918162.

The spelling of 728813615 in words is "seven hundred twenty-eight million, eight hundred thirteen thousand, six hundred fifteen".