688728085 has 16 divisors (see below), whose sum is σ = 854231040. Its totient is φ = 532523520.

The previous prime is 688728067. The next prime is 688728151. The reversal of 688728085 is 580827886.

It is not a de Polignac number, because 688728085 - 2⁹ = 688727573 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 141604 + ... + 146386.

It is an arithmetic number, because the mean of its divisors is an integer number (53389440).

Almost surely, 2^688728085 is an apocalyptic number.

It is an amenable number.

688728085 is a deficient number, since it is larger than the sum of its proper divisors (165502955).

688728085 is a wasteful number, since it uses less digits than its factorization.

688728085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748.

The product of its (nonzero) digits is 1720320, while the sum is 52.

The square root of 688728085 is about 26243.6294174415. The cubic root of 688728085 is about 883.1122946006.

The spelling of 688728085 in words is "six hundred eighty-eight million, seven hundred twenty-eight thousand, eighty-five".