660444 has 24 divisors (see below), whose sum is σ = 1575168. Its totient is φ = 215280.

The previous prime is 660409. The next prime is 660449. The reversal of 660444 is 444066.

660444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660449) by changing a digit.

660444 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 7 ways as a sum of consecutive naturals, for example, 22 + ... + 1149.

It is an arithmetic number, because the mean of its divisors is an integer number (65632).

2⁶⁶⁰⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

660444 is an abundant number, since it is smaller than the sum of its proper divisors (914724).

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

660444 is a wasteful number, since it uses less digits than its factorization.

660444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1223 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 660444 is about 812.6770576311. The cubic root of 660444 is about 87.0853963986.

The spelling of 660444 in words is "six hundred sixty thousand, four hundred forty-four".