688378696 has 8 divisors (see below), whose sum is σ = 1290710070. Its totient is φ = 344189344.

The previous prime is 688378667. The next prime is 688378727. The reversal of 688378696 is 696873886.

It can be written as a sum of positive squares in only one way, i.e., 528356196 + 160022500 = 22986^2 + 12650^2 .

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

It is an unprimeable number.

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, 43023661 + ... + 43023676.

Almost surely, 2^688378696 is an apocalyptic number.

It is an amenable number.

688378696 is a deficient number, since it is larger than the sum of its proper divisors (602331374).

688378696 is a wasteful number, since it uses less digits than its factorization.

688378696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86047343 (or 86047339 counting only the distinct ones).

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

The square root of 688378696 is about 26236.9719289403. The cubic root of 688378696 is about 882.9629362310.

The spelling of 688378696 in words is "six hundred eighty-eight million, three hundred seventy-eight thousand, six hundred ninety-six".