688618516 has 6 divisors (see below), whose sum is σ = 1205082410. Its totient is φ = 344309256.

The previous prime is 688618481. The next prime is 688618517. The reversal of 688618516 is 615816886.

It can be written as a sum of positive squares in only one way, i.e., 597606916 + 91011600 = 24446^2 + 9540^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 688618516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688618517) 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 as a sum of consecutive naturals, namely, 86077311 + ... + 86077318.

Almost surely, 2^688618516 is an apocalyptic number.

It is an amenable number.

688618516 is a deficient number, since it is larger than the sum of its proper divisors (516463894).

688618516 is a wasteful number, since it uses less digits than its factorization.

688618516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172154633 (or 172154631 counting only the distinct ones).

The product of its digits is 552960, while the sum is 49.

The square root of 688618516 is about 26241.5417992160. The cubic root of 688618516 is about 883.0654609929.

It can be divided in two parts, 68861 and 8516, that added together give a palindrome (77377).

The spelling of 688618516 in words is "six hundred eighty-eight million, six hundred eighteen thousand, five hundred sixteen".