688666468 has 36 divisors (see below), whose sum is σ = 1398452160. Its totient is φ = 290684592.

The previous prime is 688666439. The next prime is 688666477. The reversal of 688666468 is 864666886.

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 in 11 ways as a sum of consecutive naturals, for example, 122953 + ... + 128431.

Almost surely, 2^688666468 is an apocalyptic number.

It is an amenable number.

688666468 is an abundant number, since it is smaller than the sum of its proper divisors (709785692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688666468 is a wasteful number, since it uses less digits than its factorization.

688666468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5624 (or 5555 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 58.

The square root of 688666468 is about 26242.4554491381. The cubic root of 688666468 is about 883.0859579595.

The spelling of 688666468 in words is "six hundred eighty-eight million, six hundred sixty-six thousand, four hundred sixty-eight".