660870 has 48 divisors (see below), whose sum is σ = 1965600. Its totient is φ = 150912.

The previous prime is 660853. The next prime is 660887. The reversal of 660870 is 78066.

It is an interprime number because it is at equal distance from previous prime (660853) and next prime (660887).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660870.

It is an unprimeable number.

660870 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 23 ways as a sum of consecutive naturals, for example, 106 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (40950).

2⁶⁶⁰⁸⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982800).

660870 is an abundant number, since it is smaller than the sum of its proper divisors (1304730).

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

660870 is a wasteful number, since it uses less digits than its factorization.

660870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 660870 is about 812.9391121111. The cubic root of 660870 is about 87.1041163331.

The spelling of 660870 in words is "six hundred sixty thousand, eight hundred seventy".