688091879456 has 24 divisors (see below), whose sum is σ = 1360494983484. Its totient is φ = 342569344000.

The previous prime is 688091879429. The next prime is 688091879479. The reversal of 688091879456 is 654978190886.

It can be written as a sum of positive squares in 2 ways, for example, as 656650915600 + 31440963856 = 810340^2 + 177316^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 688091879456.

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, 46136045 + ... + 46150956.

Almost surely, 2^688091879456 is an apocalyptic number.

It is an amenable number.

688091879456 is a deficient number, since it is larger than the sum of its proper divisors (672403104028).

688091879456 is a wasteful number, since it uses less digits than its factorization.

688091879456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92287244 (or 92287236 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 71.

The spelling of 688091879456 in words is "six hundred eighty-eight billion, ninety-one million, eight hundred seventy-nine thousand, four hundred fifty-six".