660424 has 16 divisors (see below), whose sum is σ = 1278720. Its totient is φ = 319440.

The previous prime is 660409. The next prime is 660449. The reversal of 660424 is 424066.

It is a junction number, because it is equal to n+sod(n) for n = 660395 and 660404.

It is an unprimeable number.

660424 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 3 ways as a sum of consecutive naturals, for example, 1084 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (79920).

2⁶⁶⁰⁴²⁴ is an apocalyptic number.

It is an amenable number.

660424 is a deficient number, since it is larger than the sum of its proper divisors (618296).

660424 is a wasteful number, since it uses less digits than its factorization.

660424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700 (or 2696 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 660424 is about 812.6647525271. The cubic root of 660424 is about 87.0845173306.

The spelling of 660424 in words is "six hundred sixty thousand, four hundred twenty-four".