687998707899786 has 32 divisors (see below), whose sum is σ = 1528886876497920. Its totient is φ = 229332773791872.

The previous prime is 687998707899781. The next prime is 687998707899863.

687998707899786 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (687998707899781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177259866 + ... + 181099578.

It is an arithmetic number, because the mean of its divisors is an integer number (47777714890560).

Almost surely, 2^{687998707899786} is an apocalyptic number.

687998707899786 is an abundant number, since it is smaller than the sum of its proper divisors (840888168598134).

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

687998707899786 is a wasteful number, since it uses less digits than its factorization.

687998707899786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7157867 (or 7157861 counting only the distinct ones).

The product of its (nonzero) digits is 2322868617216, while the sum is 108.

The spelling of 687998707899786 in words is "six hundred eighty-seven trillion, nine hundred ninety-eight billion, seven hundred seven million, eight hundred ninety-nine thousand, seven hundred eighty-six".