688679776 has 24 divisors (see below), whose sum is σ = 1427199480. Its totient is φ = 326216448.

The previous prime is 688679699. The next prime is 688679867. The reversal of 688679776 is 677976886.

It is a happy number.

It is a congruent number.

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, 565741 + ... + 566956.

It is an arithmetic number, because the mean of its divisors is an integer number (59466645).

Almost surely, 2^688679776 is an apocalyptic number.

It is an amenable number.

688679776 is an abundant number, since it is smaller than the sum of its proper divisors (738519704).

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

688679776 is a wasteful number, since it uses less digits than its factorization.

688679776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132726 (or 1132718 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 64.

The square root of 688679776 is about 26242.7090065031. The cubic root of 688679776 is about 883.0916462633.

The spelling of 688679776 in words is "six hundred eighty-eight million, six hundred seventy-nine thousand, seven hundred seventy-six".