660635 has 8 divisors (see below), whose sum is σ = 814416. Its totient is φ = 514080.

The previous prime is 660619. The next prime is 660643. The reversal of 660635 is 536066.

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

It is not a de Polignac number, because 660635 - 2⁴ = 660619 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1601 + ... + 1970.

It is an arithmetic number, because the mean of its divisors is an integer number (101802).

2⁶⁶⁰⁶³⁵ is an apocalyptic number.

660635 is a deficient number, since it is larger than the sum of its proper divisors (153781).

660635 is a wasteful number, since it uses less digits than its factorization.

660635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 660635 is about 812.7945619897. The cubic root of 660635 is about 87.0937906039.

The spelling of 660635 in words is "six hundred sixty thousand, six hundred thirty-five".