688717039 has 4 divisors (see below), whose sum is σ = 729229824. Its totient is φ = 648204256.

The previous prime is 688717021. The next prime is 688717067. The reversal of 688717039 is 930717886.

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

It is a cyclic number.

It is not a de Polignac number, because 688717039 - 2¹¹ = 688714991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688716983 and 688717001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688717069) 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, 20256367 + ... + 20256400.

It is an arithmetic number, because the mean of its divisors is an integer number (182307456).

Almost surely, 2^688717039 is an apocalyptic number.

688717039 is a deficient number, since it is larger than the sum of its proper divisors (40512785).

688717039 is a wasteful number, since it uses less digits than its factorization.

688717039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40512784.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 688717039 is about 26243.4189655235. The cubic root of 688717039 is about 883.1075733805.

The spelling of 688717039 in words is "six hundred eighty-eight million, seven hundred seventeen thousand, thirty-nine".