660906 has 16 divisors (see below), whose sum is σ = 1468800. Its totient is φ = 220284.

The previous prime is 660901. The next prime is 660917. The reversal of 660906 is 609066.

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

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 660906.

It is not an unprimeable number, because it can be changed into a prime (660901) by changing a digit.

660906 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6066 + ... + 6173.

It is an arithmetic number, because the mean of its divisors is an integer number (91800).

2⁶⁶⁰⁹⁰⁶ is an apocalyptic number.

660906 is an abundant number, since it is smaller than the sum of its proper divisors (807894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660906 is a wasteful number, since it uses less digits than its factorization.

660906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12250 (or 12244 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 660906 is about 812.9612536893. The cubic root of 660906 is about 87.1056979307.

The spelling of 660906 in words is "six hundred sixty thousand, nine hundred six".