689732 has 6 divisors (see below), whose sum is σ = 1207038. Its totient is φ = 344864.

The previous prime is 689723. The next prime is 689761. The reversal of 689732 is 237986.

It can be written as a sum of positive squares in only one way, i.e., 614656 + 75076 = 784^2 + 274^2 .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 689692 and 689701.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689732.

It is an unprimeable number.

689732 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 as a sum of consecutive naturals, namely, 86213 + ... + 86220.

It is an arithmetic number, because the mean of its divisors is an integer number (201173).

2⁶⁸⁹⁷³² is an apocalyptic number.

It is an amenable number.

689732 is a deficient number, since it is larger than the sum of its proper divisors (517306).

689732 is a wasteful number, since it uses less digits than its factorization.

689732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172437 (or 172435 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 689732 is about 830.5010535815. The cubic root of 689732 is about 88.3541171774.

The spelling of 689732 in words is "six hundred eighty-nine thousand, seven hundred thirty-two".