660384 has 36 divisors (see below), whose sum is σ = 1878786. Its totient is φ = 220032.

The previous prime is 660379. The next prime is 660391. The reversal of 660384 is 483066.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 51984 = 780^2 + 228^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×660384² = 872214054912, which contains 22 as substring.

It is an unprimeable number.

660384 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 5 ways as a sum of consecutive naturals, for example, 859 + ... + 1434.

2⁶⁶⁰³⁸⁴ is an apocalyptic number.

It is an amenable number.

660384 is an abundant number, since it is smaller than the sum of its proper divisors (1218402).

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

660384 is a wasteful number, since it uses less digits than its factorization.

660384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309 (or 2298 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 660384 is about 812.6401417602. The cubic root of 660384 is about 87.0827591414.

The spelling of 660384 in words is "six hundred sixty thousand, three hundred eighty-four".