660089 has 4 divisors (see below), whose sum is σ = 663156. Its totient is φ = 657024.

The previous prime is 660073. The next prime is 660097. The reversal of 660089 is 980066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 980066 = 2 ⋅490033.

It can be written as a sum of positive squares in 2 ways, for example, as 193600 + 466489 = 440^2 + 683^2 .

It is a cyclic number.

It is not a de Polignac number, because 660089 - 2⁴ = 660073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1184 + ... + 1649.

It is an arithmetic number, because the mean of its divisors is an integer number (165789).

2⁶⁶⁰⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

660089 is a deficient number, since it is larger than the sum of its proper divisors (3067).

660089 is a wasteful number, since it uses less digits than its factorization.

660089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 660089 is about 812.4586143306. The cubic root of 660089 is about 87.0697903030.

The spelling of 660089 in words is "six hundred sixty thousand, eighty-nine".