660958 has 8 divisors (see below), whose sum is σ = 1001952. Its totient is φ = 326976.

The previous prime is 660949. The next prime is 660973. The reversal of 660958 is 859066.

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

It is a congruent number.

It is an unprimeable number.

660958 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510 + ... + 1897.

It is an arithmetic number, because the mean of its divisors is an integer number (125244).

2⁶⁶⁰⁹⁵⁸ is an apocalyptic number.

660958 is a deficient number, since it is larger than the sum of its proper divisors (340994).

660958 is a wasteful number, since it uses less digits than its factorization.

660958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 660958 is about 812.9932349042. The cubic root of 660958 is about 87.1079823592.

The spelling of 660958 in words is "six hundred sixty thousand, nine hundred fifty-eight".