660673 has 4 divisors (see below), whose sum is σ = 711508. Its totient is φ = 609840.

The previous prime is 660661. The next prime is 660683. The reversal of 660673 is 376066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 418609 + 242064 = 647^2 + 492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660673 is a prime.

It is a Duffinian number.

660673 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (660643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25398 + ... + 25423.

It is an arithmetic number, because the mean of its divisors is an integer number (177877).

2⁶⁶⁰⁶⁷³ is an apocalyptic number.

It is an amenable number.

660673 is a deficient number, since it is larger than the sum of its proper divisors (50835).

660673 is a wasteful number, since it uses less digits than its factorization.

660673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50834.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 660673 is about 812.8179377942. The cubic root of 660673 is about 87.0954604622.

The spelling of 660673 in words is "six hundred sixty thousand, six hundred seventy-three".