660789 has 6 divisors (see below), whose sum is σ = 954486. Its totient is φ = 440520.

The previous prime is 660787. The next prime is 660791. The reversal of 660789 is 987066.

It is an interprime number because it is at equal distance from previous prime (660787) and next prime (660791).

It can be written as a sum of positive squares in only one way, i.e., 400689 + 260100 = 633^2 + 510^2 .

It is not a de Polignac number, because 660789 - 2¹ = 660787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660787) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36702 + ... + 36719.

It is an arithmetic number, because the mean of its divisors is an integer number (159081).

2⁶⁶⁰⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

660789 is a deficient number, since it is larger than the sum of its proper divisors (293697).

660789 is a wasteful number, since it uses less digits than its factorization.

660789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73427 (or 73424 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 660789 is about 812.8892913552. The cubic root of 660789 is about 87.1005575285.

The spelling of 660789 in words is "six hundred sixty thousand, seven hundred eighty-nine".