687305747503786 has 4 divisors (see below), whose sum is σ = 1030958621255682. Its totient is φ = 343652873751892.

The previous prime is 687305747503741. The next prime is 687305747503789.

687305747503786 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 447112505151225 + 240193242352561 = 21145035^2 + 15498169^2 .

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (687305747503789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171826436875945 + ... + 171826436875948.

Almost surely, 2^{687305747503786} is an apocalyptic number.

687305747503786 is a deficient number, since it is larger than the sum of its proper divisors (343652873751896).

687305747503786 is a wasteful number, since it uses less digits than its factorization.

687305747503786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343652873751895.

The product of its (nonzero) digits is 4978713600, while the sum is 76.

The spelling of 687305747503786 in words is "six hundred eighty-seven trillion, three hundred five billion, seven hundred forty-seven million, five hundred three thousand, seven hundred eighty-six".