688601 has 4 divisors (see below), whose sum is σ = 691152. Its totient is φ = 686052.

The previous prime is 688591. The next prime is 688621. The reversal of 688601 is 106886.

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 a de Polignac number, because none of the positive numbers 2^k-688601 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 688601.

It is not an unprimeable number, because it can be changed into a prime (688621) 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, 815 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (172788).

2⁶⁸⁸⁶⁰¹ is an apocalyptic number.

It is an amenable number.

688601 is a deficient number, since it is larger than the sum of its proper divisors (2551).

688601 is a wasteful number, since it uses less digits than its factorization.

688601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 688601 is about 829.8198599696. The cubic root of 688601 is about 88.3057973584.

The spelling of 688601 in words is "six hundred eighty-eight thousand, six hundred one".