660260 has 12 divisors (see below), whose sum is σ = 1386588. Its totient is φ = 264096.

The previous prime is 660251. The next prime is 660271. The reversal of 660260 is 62066.

It can be written as a sum of positive squares in 2 ways, for example, as 173056 + 487204 = 416^2 + 698^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 33013 = 660260 / (6 + 6 + 0 + 2 + 6 + 0).

It is an unprimeable number.

660260 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16487 + ... + 16526.

It is an arithmetic number, because the mean of its divisors is an integer number (115549).

2⁶⁶⁰²⁶⁰ is an apocalyptic number.

It is an amenable number.

660260 is an abundant number, since it is smaller than the sum of its proper divisors (726328).

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

660260 is a wasteful number, since it uses less digits than its factorization.

660260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33022 (or 33020 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 660260 is about 812.5638436455. The cubic root of 660260 is about 87.0773083037.

The spelling of 660260 in words is "six hundred sixty thousand, two hundred sixty".