660120 has 32 divisors (see below), whose sum is σ = 1980720. Its totient is φ = 176000.

The previous prime is 660119. The next prime is 660131. The reversal of 660120 is 21066.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 660120.

It is a congruent number.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 2631 + ... + 2870.

2⁶⁶⁰¹²⁰ is an apocalyptic number.

660120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660120 is an abundant number, since it is smaller than the sum of its proper divisors (1320600).

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

660120 is a wasteful number, since it uses less digits than its factorization.

660120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5515 (or 5511 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 660120 is about 812.4776920014. The cubic root of 660120 is about 87.0711533118.

Adding to 660120 its reverse (21066), we get a palindrome (681186).

It can be divided in two parts, 660 and 120, that added together give a triangular number (780 = T₃₉).

The spelling of 660120 in words is "six hundred sixty thousand, one hundred twenty".