687658856786 has 16 divisors (see below), whose sum is σ = 1128878157888. Its totient is φ = 311567149200.

The previous prime is 687658856737. The next prime is 687658856803.

687658856786 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×687658856786³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 687658856786.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50245925 + ... + 50259608.

It is an arithmetic number, because the mean of its divisors is an integer number (70554884868).

Almost surely, 2^687658856786 is an apocalyptic number.

687658856786 is a deficient number, since it is larger than the sum of its proper divisors (441219301102).

687658856786 is a wasteful number, since it uses less digits than its factorization.

687658856786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100505857.

The product of its digits is 6502809600, while the sum is 80.

The spelling of 687658856786 in words is "six hundred eighty-seven billion, six hundred fifty-eight million, eight hundred fifty-six thousand, seven hundred eighty-six".