689671 has 4 divisors (see below), whose sum is σ = 692392. Its totient is φ = 686952.

The previous prime is 689641. The next prime is 689693. The reversal of 689671 is 176986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176986 = 2 ⋅88493.

It is a cyclic number.

It is not a de Polignac number, because 689671 - 2¹¹ = 687623 is a prime.

It is a d-powerful number, because it can be written as 6² + 8⁵ + 6⁵ + 9⁶ + 7⁶ + 1 .

It is a Duffinian number.

689671 is a lucky number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 689671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689621) 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, 936 + ... + 1501.

It is an arithmetic number, because the mean of its divisors is an integer number (173098).

2⁶⁸⁹⁶⁷¹ is an apocalyptic number.

689671 is a deficient number, since it is larger than the sum of its proper divisors (2721).

689671 is a wasteful number, since it uses less digits than its factorization.

689671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720.

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

The square root of 689671 is about 830.4643279515. The cubic root of 689671 is about 88.3515124169.

The spelling of 689671 in words is "six hundred eighty-nine thousand, six hundred seventy-one".