688068868 has 12 divisors (see below), whose sum is σ = 1204705180. Its totient is φ = 343867392.

The previous prime is 688068833. The next prime is 688068911. The reversal of 688068868 is 868860886.

It can be written as a sum of positive squares in 2 ways, for example, as 74615044 + 613453824 = 8638^2 + 24768^2 .

It is a super-2 number, since 2×688068868² = 946877534221602848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32253 + ... + 49156.

Almost surely, 2^688068868 is an apocalyptic number.

It is an amenable number.

688068868 is a deficient number, since it is larger than the sum of its proper divisors (516636312).

688068868 is a wasteful number, since it uses less digits than its factorization.

688068868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83526 (or 83524 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 58.

The square root of 688068868 is about 26231.0668483003. The cubic root of 688068868 is about 882.8304472899.

The spelling of 688068868 in words is "six hundred eighty-eight million, sixty-eight thousand, eight hundred sixty-eight".