688376968 has 8 divisors (see below), whose sum is σ = 1290706830. Its totient is φ = 344188480.

The previous prime is 688376963. The next prime is 688377029. The reversal of 688376968 is 869673886.

It can be written as a sum of positive squares in only one way, i.e., 618119044 + 70257924 = 24862^2 + 8382^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×688376968³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (688376963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43023553 + ... + 43023568.

Almost surely, 2^688376968 is an apocalyptic number.

It is an amenable number.

688376968 is a deficient number, since it is larger than the sum of its proper divisors (602329862).

688376968 is a wasteful number, since it uses less digits than its factorization.

688376968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86047127 (or 86047123 counting only the distinct ones).

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

The square root of 688376968 is about 26236.9389982902. The cubic root of 688376968 is about 882.9621974123.

The spelling of 688376968 in words is "six hundred eighty-eight million, three hundred seventy-six thousand, nine hundred sixty-eight".