689730 has 32 divisors (see below), whose sum is σ = 1681344. Its totient is φ = 181056.

The previous prime is 689723. The next prime is 689761. The reversal of 689730 is 37986.

It is a happy number.

It is a Curzon number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 689691 and 689700.

It is an unprimeable number.

689730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2352 + ... + 2628.

It is an arithmetic number, because the mean of its divisors is an integer number (52542).

2⁶⁸⁹⁷³⁰ is an apocalyptic number.

It is a pronic number, being equal to 830×831.

689730 is an abundant number, since it is smaller than the sum of its proper divisors (991614).

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

689730 is a wasteful number, since it uses less digits than its factorization.

689730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 689730 is about 830.4998494882. The cubic root of 689730 is about 88.3540317778.

The spelling of 689730 in words is "six hundred eighty-nine thousand, seven hundred thirty".