689617 has 4 divisors (see below), whose sum is σ = 694336. Its totient is φ = 684900.

The previous prime is 689603. The next prime is 689621. The reversal of 689617 is 716986.

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-689617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689317) 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, 2133 + ... + 2434.

It is an arithmetic number, because the mean of its divisors is an integer number (173584).

2⁶⁸⁹⁶¹⁷ is an apocalyptic number.

It is an amenable number.

689617 is a deficient number, since it is larger than the sum of its proper divisors (4719).

689617 is a wasteful number, since it uses less digits than its factorization.

689617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4718.

The product of its digits is 18144, while the sum is 37.

The square root of 689617 is about 830.4318153828. The cubic root of 689617 is about 88.3492064351.

The spelling of 689617 in words is "six hundred eighty-nine thousand, six hundred seventeen".