688343866 has 24 divisors (see below), whose sum is σ = 1202554080. Its totient is φ = 294644952.

The previous prime is 688343861. The next prime is 688343867. The reversal of 688343866 is 668343886.

It is not an unprimeable number, because it can be changed into a prime (688343861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86241 + ... + 93883.

It is an arithmetic number, because the mean of its divisors is an integer number (50106420).

Almost surely, 2^688343866 is an apocalyptic number.

688343866 is a deficient number, since it is larger than the sum of its proper divisors (514210214).

688343866 is a wasteful number, since it uses less digits than its factorization.

688343866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8578 (or 8571 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 52.

The square root of 688343866 is about 26236.3081625445. The cubic root of 688343866 is about 882.9480441772.

The spelling of 688343866 in words is "six hundred eighty-eight million, three hundred forty-three thousand, eight hundred sixty-six".