660628 has 12 divisors (see below), whose sum is σ = 1161972. Its totient is φ = 328640.

The previous prime is 660619. The next prime is 660643. The reversal of 660628 is 826066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 101124 + 559504 = 318^2 + 748^2 .

It is a junction number, because it is equal to n+sod(n) for n = 660596 and 660605.

It is a congruent number.

It is an unprimeable number.

660628 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 1008 + ... + 1528.

It is an arithmetic number, because the mean of its divisors is an integer number (96831).

2⁶⁶⁰⁶²⁸ is an apocalyptic number.

It is an amenable number.

660628 is a deficient number, since it is larger than the sum of its proper divisors (501344).

660628 is a wasteful number, since it uses less digits than its factorization.

660628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 660628 is about 812.7902558471. The cubic root of 660628 is about 87.0934829914.

The spelling of 660628 in words is "six hundred sixty thousand, six hundred twenty-eight".