688628985 has 32 divisors (see below), whose sum is σ = 1203268608. Its totient is φ = 333520320.

The previous prime is 688628981. The next prime is 688628987. The reversal of 688628985 is 589826886.

688628985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 688628985 - 2² = 688628981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (688628981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213394 + ... + 216596.

It is an arithmetic number, because the mean of its divisors is an integer number (37602144).

Almost surely, 2^688628985 is an apocalyptic number.

It is an amenable number.

688628985 is a deficient number, since it is larger than the sum of its proper divisors (514639623).

688628985 is a wasteful number, since it uses less digits than its factorization.

688628985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4525.

The product of its digits is 13271040, while the sum is 60.

The square root of 688628985 is about 26241.7412722555. The cubic root of 688628985 is about 883.0699360229.

The spelling of 688628985 in words is "six hundred eighty-eight million, six hundred twenty-eight thousand, nine hundred eighty-five".