660285 has 32 divisors (see below), whose sum is σ = 1207680. Its totient is φ = 342144.

The previous prime is 660281. The next prime is 660299. The reversal of 660285 is 582066.

660285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660285 - 2² = 660281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

660285 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660285.

It is not an unprimeable number, because it can be changed into a prime (660281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9009 + ... + 9081.

It is an arithmetic number, because the mean of its divisors is an integer number (37740).

2⁶⁶⁰²⁸⁵ is an apocalyptic number.

It is an amenable number.

660285 is a deficient number, since it is larger than the sum of its proper divisors (547395).

660285 is a wasteful number, since it uses less digits than its factorization.

660285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 660285 is about 812.5792269065. The cubic root of 660285 is about 87.0784073178.

The spelling of 660285 in words is "six hundred sixty thousand, two hundred eighty-five".