687100108729 has 4 divisors (see below), whose sum is σ = 695378423376. Its totient is φ = 678821794084.

The previous prime is 687100108699. The next prime is 687100108789. The reversal of 687100108729 is 927801001786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687100108729 - 2⁵ = 687100108697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687100108789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4139157199 + ... + 4139157364.

It is an arithmetic number, because the mean of its divisors is an integer number (173844605844).

Almost surely, 2^687100108729 is an apocalyptic number.

It is an amenable number.

687100108729 is a deficient number, since it is larger than the sum of its proper divisors (8278314647).

687100108729 is an equidigital number, since it uses as much as digits as its factorization.

687100108729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8278314646.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 687100108729 in words is "six hundred eighty-seven billion, one hundred million, one hundred eight thousand, seven hundred twenty-nine".