689585 has 12 divisors (see below), whose sum is σ = 899892. Its totient is φ = 504288.

The previous prime is 689581. The next prime is 689587. The reversal of 689585 is 585986.

It can be written as a sum of positive squares in 2 ways, for example, as 169744 + 519841 = 412^2 + 721^2 .

It is not a de Polignac number, because 689585 - 2² = 689581 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6644 + ... + 6746.

It is an arithmetic number, because the mean of its divisors is an integer number (74991).

2⁶⁸⁹⁵⁸⁵ is an apocalyptic number.

689585 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

689585 is a deficient number, since it is larger than the sum of its proper divisors (210307).

689585 is a wasteful number, since it uses less digits than its factorization.

689585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 121 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 689585 is about 830.4125480748. The cubic root of 689585 is about 88.3478398706.

The spelling of 689585 in words is "six hundred eighty-nine thousand, five hundred eighty-five".