660708 has 18 divisors (see below), whose sum is σ = 1670214. Its totient is φ = 220224.

The previous prime is 660683. The next prime is 660719. The reversal of 660708 is 807066.

It can be written as a sum of positive squares in only one way, i.e., 381924 + 278784 = 618^2 + 528^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×660708² = 873070122528, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660708.

It is an unprimeable number.

660708 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 5 ways as a sum of consecutive naturals, for example, 9141 + ... + 9212.

2⁶⁶⁰⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

660708 is an abundant number, since it is smaller than the sum of its proper divisors (1009506).

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

660708 is a wasteful number, since it uses less digits than its factorization.

660708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18363 (or 18358 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 660708 is about 812.8394675457. The cubic root of 660708 is about 87.0969984330.

The spelling of 660708 in words is "six hundred sixty thousand, seven hundred eight".