688276668 has 24 divisors (see below), whose sum is σ = 1610753872. Its totient is φ = 228743424.

The previous prime is 688276651. The next prime is 688276697. The reversal of 688276668 is 866672886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81055 + ... + 89142.

Almost surely, 2^688276668 is an apocalyptic number.

It is an amenable number.

688276668 is an abundant number, since it is smaller than the sum of its proper divisors (922477204).

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

688276668 is a wasteful number, since it uses less digits than its factorization.

688276668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170541 (or 170539 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 57.

The square root of 688276668 is about 26235.0275014150. The cubic root of 688276668 is about 882.9193113125.

The spelling of 688276668 in words is "six hundred eighty-eight million, two hundred seventy-six thousand, six hundred sixty-eight".