660746 has 8 divisors (see below), whose sum is σ = 1018020. Its totient is φ = 321408.

The previous prime is 660733. The next prime is 660757. The reversal of 660746 is 647066.

It can be written as a sum of positive squares in 2 ways, for example, as 657721 + 3025 = 811^2 + 55^2 .

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

It is an unprimeable number.

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, 4391 + ... + 4538.

2⁶⁶⁰⁷⁴⁶ is an apocalyptic number.

660746 is a deficient number, since it is larger than the sum of its proper divisors (357274).

660746 is a wasteful number, since it uses less digits than its factorization.

660746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8968.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 660746 is about 812.8628420589. The cubic root of 660746 is about 87.0986681683.

The spelling of 660746 in words is "six hundred sixty thousand, seven hundred forty-six".