728708735 has 4 divisors (see below), whose sum is σ = 874450488. Its totient is φ = 582966984.

The previous prime is 728708711. The next prime is 728708737. The reversal of 728708735 is 537807827.

It is a happy number.

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 728708735 - 2¹⁶ = 728643199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728708735.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728708737) 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, 72870869 + ... + 72870878.

It is an arithmetic number, because the mean of its divisors is an integer number (218612622).

Almost surely, 2^728708735 is an apocalyptic number.

728708735 is a deficient number, since it is larger than the sum of its proper divisors (145741753).

728708735 is a wasteful number, since it uses less digits than its factorization.

728708735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145741752.

The product of its (nonzero) digits is 658560, while the sum is 47.

The square root of 728708735 is about 26994.6056648361. The cubic root of 728708735 is about 899.8801218933.

The spelling of 728708735 in words is "seven hundred twenty-eight million, seven hundred eight thousand, seven hundred thirty-five".