660380 has 48 divisors (see below), whose sum is σ = 1632960. Its totient is φ = 219648.

The previous prime is 660379. The next prime is 660391. The reversal of 660380 is 83066.

It is a super-2 number, since 2×660380² = 872203488800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7376 + ... + 7464.

It is an arithmetic number, because the mean of its divisors is an integer number (34020).

2⁶⁶⁰³⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816480).

660380 is an abundant number, since it is smaller than the sum of its proper divisors (972580).

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

660380 is a wasteful number, since it uses less digits than its factorization.

660380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 660380 is about 812.6376806425. The cubic root of 660380 is about 87.0825833186.

The spelling of 660380 in words is "six hundred sixty thousand, three hundred eighty".