687117711786 has 64 divisors (see below), whose sum is σ = 1578247372800. Its totient is φ = 197236425600.

The previous prime is 687117711757. The next prime is 687117711799.

687117711786 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13428631 + ... + 13479701.

It is an arithmetic number, because the mean of its divisors is an integer number (24660115200).

Almost surely, 2^687117711786 is an apocalyptic number.

687117711786 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

687117711786 is an abundant number, since it is smaller than the sum of its proper divisors (891129661014).

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

687117711786 is a wasteful number, since it uses less digits than its factorization.

687117711786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61835.

The product of its digits is 5531904, while the sum is 60.

The spelling of 687117711786 in words is "six hundred eighty-seven billion, one hundred seventeen million, seven hundred eleven thousand, seven hundred eighty-six".