688689073 has 8 divisors (see below), whose sum is σ = 703709568. Its totient is φ = 673683984.

The previous prime is 688689059. The next prime is 688689083. The reversal of 688689073 is 370986886.

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 688689073 - 2²¹ = 686591921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688689083) 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, 176815 + ... + 180667.

It is an arithmetic number, because the mean of its divisors is an integer number (87963696).

Almost surely, 2^688689073 is an apocalyptic number.

It is an amenable number.

688689073 is a deficient number, since it is larger than the sum of its proper divisors (15020495).

688689073 is a wasteful number, since it uses less digits than its factorization.

688689073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7703.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 688689073 is about 26242.8861408192. The cubic root of 688689073 is about 883.0956200822.

It can be divided in two parts, 6886 and 89073, that added together give a palindrome (95959).

The spelling of 688689073 in words is "six hundred eighty-eight million, six hundred eighty-nine thousand, seventy-three".