660445 has 8 divisors (see below), whose sum is σ = 827136. Its totient is φ = 505296.

The previous prime is 660409. The next prime is 660449. The reversal of 660445 is 544066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660445 is a prime.

It is a Duffinian number.

660445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660449) 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 7 ways as a sum of consecutive naturals, for example, 2757 + ... + 2986.

It is an arithmetic number, because the mean of its divisors is an integer number (103392).

2⁶⁶⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

660445 is a deficient number, since it is larger than the sum of its proper divisors (166691).

660445 is a wasteful number, since it uses less digits than its factorization.

660445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 660445 is about 812.6776728814. The cubic root of 660445 is about 87.0854403515.

It can be divided in two parts, 66044 and 5, that added together give a square (66049 = 257²).

The spelling of 660445 in words is "six hundred sixty thousand, four hundred forty-five".