660860 has 24 divisors (see below), whose sum is σ = 1403136. Its totient is φ = 261440.

The previous prime is 660853. The next prime is 660887. The reversal of 660860 is 68066.

660860 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3365 + ... + 3555.

It is an arithmetic number, because the mean of its divisors is an integer number (58464).

2⁶⁶⁰⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

660860 is an abundant number, since it is smaller than the sum of its proper divisors (742276).

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

660860 is a wasteful number, since it uses less digits than its factorization.

660860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 660860 is about 812.9329615657. The cubic root of 660860 is about 87.1036769903.

The spelling of 660860 in words is "six hundred sixty thousand, eight hundred sixty".