660885 has 8 divisors (see below), whose sum is σ = 1057440. Its totient is φ = 352464.

The previous prime is 660853. The next prime is 660887. The reversal of 660885 is 588066.

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

It is not a de Polignac number, because 660885 - 2⁵ = 660853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22015 + ... + 22044.

It is an arithmetic number, because the mean of its divisors is an integer number (132180).

2⁶⁶⁰⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

660885 is a deficient number, since it is larger than the sum of its proper divisors (396555).

660885 is a wasteful number, since it uses less digits than its factorization.

660885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44067.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 660885 is about 812.9483378420. The cubic root of 660885 is about 87.1047753391.

The spelling of 660885 in words is "six hundred sixty thousand, eight hundred eighty-five".