688736689 has 8 divisors (see below), whose sum is σ = 716472000. Its totient is φ = 661267152.

The previous prime is 688736683. The next prime is 688736693. The reversal of 688736689 is 986637886.

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

It is a cyclic number.

It is not a de Polignac number, because 688736689 - 2¹⁹ = 688212401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688736683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61149 + ... + 71530.

It is an arithmetic number, because the mean of its divisors is an integer number (89559000).

Almost surely, 2^688736689 is an apocalyptic number.

It is an amenable number.

688736689 is a deficient number, since it is larger than the sum of its proper divisors (27735311).

688736689 is a wasteful number, since it uses less digits than its factorization.

688736689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132887.

The product of its digits is 20901888, while the sum is 61.

The square root of 688736689 is about 26243.7933424267. The cubic root of 688736689 is about 883.1159720396.

The spelling of 688736689 in words is "six hundred eighty-eight million, seven hundred thirty-six thousand, six hundred eighty-nine".