687688886786 has 32 divisors (see below), whose sum is σ = 1191608936640. Its totient is φ = 294172480000.

The previous prime is 687688886713. The next prime is 687688886809.

687688886786 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 687688886698 and 687688886707.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4506830 + ... + 4656918.

It is an arithmetic number, because the mean of its divisors is an integer number (37237779270).

Almost surely, 2^687688886786 is an apocalyptic number.

687688886786 is a deficient number, since it is larger than the sum of its proper divisors (503920049854).

687688886786 is a wasteful number, since it uses less digits than its factorization.

687688886786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162370.

The product of its digits is 16647192576, while the sum is 86.

The spelling of 687688886786 in words is "six hundred eighty-seven billion, six hundred eighty-eight million, eight hundred eighty-six thousand, seven hundred eighty-six".