689660 has 12 divisors (see below), whose sum is σ = 1448328. Its totient is φ = 275856.

The previous prime is 689641. The next prime is 689693. The reversal of 689660 is 66986.

It is a self number, because there is not a number n which added to its sum of digits gives 689660.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17222 + ... + 17261.

It is an arithmetic number, because the mean of its divisors is an integer number (120694).

2⁶⁸⁹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

689660 is an abundant number, since it is smaller than the sum of its proper divisors (758668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689660 is a wasteful number, since it uses less digits than its factorization.

689660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34492 (or 34490 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 689660 is about 830.4577051241. The cubic root of 689660 is about 88.3510426896.

The spelling of 689660 in words is "six hundred eighty-nine thousand, six hundred sixty".