660028 has 12 divisors (see below), whose sum is σ = 1163512. Its totient is φ = 327600.

The previous prime is 660013. The next prime is 660029. The reversal of 660028 is 820066.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 659990 and 660008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660029) by changing a digit.

660028 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, 103 + ... + 1153.

2⁶⁶⁰⁰²⁸ is an apocalyptic number.

It is an amenable number.

660028 is a deficient number, since it is larger than the sum of its proper divisors (503484).

660028 is a wasteful number, since it uses less digits than its factorization.

660028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 660028 is about 812.4210730896. The cubic root of 660028 is about 87.0671081289.

The spelling of 660028 in words is "six hundred sixty thousand, twenty-eight".