660345 has 32 divisors (see below), whose sum is σ = 1274880. Its totient is φ = 285120.

The previous prime is 660337. The next prime is 660347. The reversal of 660345 is 543066.

660345 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 660345 - 2³ = 660337 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660345.

It is not an unprimeable number, because it can be changed into a prime (660347) 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, 1830 + ... + 2160.

It is an arithmetic number, because the mean of its divisors is an integer number (39840).

2⁶⁶⁰³⁴⁵ is an apocalyptic number.

It is an amenable number.

660345 is a deficient number, since it is larger than the sum of its proper divisors (614535).

660345 is a wasteful number, since it uses less digits than its factorization.

660345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 660345 is about 812.6161455447. The cubic root of 660345 is about 87.0810448386.

The spelling of 660345 in words is "six hundred sixty thousand, three hundred forty-five".