687748847786 has 128 divisors (see below), whose sum is σ = 1395462297600. Its totient is φ = 245500220160.

The previous prime is 687748847759. The next prime is 687748847831.

It is a happy number.

687748847786 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 687748847786.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 234006305 + ... + 234009243.

It is an arithmetic number, because the mean of its divisors is an integer number (10902049200).

Almost surely, 2^687748847786 is an apocalyptic number.

687748847786 is an abundant number, since it is smaller than the sum of its proper divisors (707713449814).

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

687748847786 is a wasteful number, since it uses less digits than its factorization.

687748847786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804.

The product of its digits is 5664669696, while the sum is 80.

The spelling of 687748847786 in words is "six hundred eighty-seven billion, seven hundred forty-eight million, eight hundred forty-seven thousand, seven hundred eighty-six".