650689 has 4 divisors (see below), whose sum is σ = 700756. Its totient is φ = 600624.

The previous prime is 650669. The next prime is 650701. The reversal of 650689 is 986056.

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 400689 + 250000 = 633^2 + 500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25014 + ... + 25039.

It is an arithmetic number, because the mean of its divisors is an integer number (175189).

2⁶⁵⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

650689 is a deficient number, since it is larger than the sum of its proper divisors (50067).

650689 is a wasteful number, since it uses less digits than its factorization.

650689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50066.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 650689 is about 806.6529613161. The cubic root of 650689 is about 86.6545068410.

The spelling of 650689 in words is "six hundred fifty thousand, six hundred eighty-nine".