689727361 has 4 divisors (see below), whose sum is σ = 690403924. Its totient is φ = 689050800.

The previous prime is 689727331. The next prime is 689727373. The reversal of 689727361 is 163727986.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 345402225 + 344325136 = 18585^2 + 18556^2 .

It is a cyclic number.

It is not a de Polignac number, because 689727361 - 2¹³ = 689719169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689727301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336750 + ... + 338791.

It is an arithmetic number, because the mean of its divisors is an integer number (172600981).

Almost surely, 2^689727361 is an apocalyptic number.

It is an amenable number.

689727361 is a deficient number, since it is larger than the sum of its proper divisors (676563).

689727361 is a wasteful number, since it uses less digits than its factorization.

689727361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676562.

The product of its digits is 762048, while the sum is 49.

The square root of 689727361 is about 26262.6609657133. The cubic root of 689727361 is about 883.5391909286.

The spelling of 689727361 in words is "six hundred eighty-nine million, seven hundred twenty-seven thousand, three hundred sixty-one".