687727768123 has 24 divisors (see below), whose sum is σ = 782037139968. Its totient is φ = 603918480000.

The previous prime is 687727768073. The next prime is 687727768141. The reversal of 687727768123 is 321867727786.

687727768123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 687727768123 - 2⁹ = 687727767611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687727768423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185211 + ... + 1187332.

It is an arithmetic number, because the mean of its divisors is an integer number (32584880832).

Almost surely, 2^687727768123 is an apocalyptic number.

687727768123 is a deficient number, since it is larger than the sum of its proper divisors (94309371845).

687727768123 is a wasteful number, since it uses less digits than its factorization.

687727768123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372707 (or 1372696 counting only the distinct ones).

The product of its digits is 66382848, while the sum is 64.

The spelling of 687727768123 in words is "six hundred eighty-seven billion, seven hundred twenty-seven million, seven hundred sixty-eight thousand, one hundred twenty-three".