688120047 has 6 divisors (see below), whose sum is σ = 993951192. Its totient is φ = 458746692.

The previous prime is 688120021. The next prime is 688120057. The reversal of 688120047 is 740021886.

688120047 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 688120047 - 2¹⁰ = 688119023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688119993 and 688120020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688120007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38228883 + ... + 38228900.

It is an arithmetic number, because the mean of its divisors is an integer number (165658532).

Almost surely, 2^688120047 is an apocalyptic number.

688120047 is a deficient number, since it is larger than the sum of its proper divisors (305831145).

688120047 is a wasteful number, since it uses less digits than its factorization.

688120047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76457789 (or 76457786 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 688120047 is about 26232.0423718779. The cubic root of 688120047 is about 882.8523352440.

The spelling of 688120047 in words is "six hundred eighty-eight million, one hundred twenty thousand, forty-seven".