688915085 has 8 divisors (see below), whose sum is σ = 827010456. Its totient is φ = 550923840.

The previous prime is 688915081. The next prime is 688915109. The reversal of 688915085 is 580519886.

It can be written as a sum of positive squares in 4 ways, for example, as 77193796 + 611721289 = 8786^2 + 24733^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 688915085 - 2² = 688915081 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 (688915081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10646 + ... + 38615.

It is an arithmetic number, because the mean of its divisors is an integer number (103376307).

Almost surely, 2^688915085 is an apocalyptic number.

It is an amenable number.

688915085 is a deficient number, since it is larger than the sum of its proper divisors (138095371).

688915085 is a wasteful number, since it uses less digits than its factorization.

688915085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52063.

The product of its (nonzero) digits is 691200, while the sum is 50.

The square root of 688915085 is about 26247.1919450443. The cubic root of 688915085 is about 883.1922134436.

The spelling of 688915085 in words is "six hundred eighty-eight million, nine hundred fifteen thousand, eighty-five".