66860 has 12 divisors (see below), whose sum is σ = 140448. Its totient is φ = 26736.

The previous prime is 66853. The next prime is 66863. The reversal of 66860 is 6866.

It is not an unprimeable number, because it can be changed into a prime (66863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652 + ... + 1691.

It is an arithmetic number, because the mean of its divisors is an integer number (11704).

2⁶⁶⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

66860 is an abundant number, since it is smaller than the sum of its proper divisors (73588).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70224).

66860 is a wasteful number, since it uses less digits than its factorization.

66860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352 (or 3350 counting only the distinct ones).

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

The square root of 66860 is about 258.5730070986. The cubic root of 66860 is about 40.5871718877.

The spelling of 66860 in words is "sixty-six thousand, eight hundred sixty".