689765 has 16 divisors (see below), whose sum is σ = 881280. Its totient is φ = 517440.

The previous prime is 689761. The next prime is 689771. The reversal of 689765 is 567986.

It is a happy number.

It is not a de Polignac number, because 689765 - 2² = 689761 is a prime.

It is a d-powerful number, because it can be written as 6 + 8⁵ + 7⁶ + 9⁶ + 6⁵ + 5³ .

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689765.

It is not an unprimeable number, because it can be changed into a prime (689761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9680 + ... + 9750.

It is an arithmetic number, because the mean of its divisors is an integer number (55080).

2⁶⁸⁹⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

689765 is a deficient number, since it is larger than the sum of its proper divisors (191515).

689765 is a wasteful number, since it uses less digits than its factorization.

689765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172.

The product of its digits is 90720, while the sum is 41.

The square root of 689765 is about 830.5209208683. The cubic root of 689765 is about 88.3555262461.

The spelling of 689765 in words is "six hundred eighty-nine thousand, seven hundred sixty-five".