666770 has 32 divisors (see below), whose sum is σ = 1354752. Its totient is φ = 234432.

The previous prime is 666769. The next prime is 666773. The reversal of 666770 is 77666.

It is not an unprimeable number, because it can be changed into a prime (666773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2879 + ... + 3101.

It is an arithmetic number, because the mean of its divisors is an integer number (42336).

2⁶⁶⁶⁷⁷⁰ is an apocalyptic number.

666770 is an abundant number, since it is smaller than the sum of its proper divisors (687982).

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

666770 is a wasteful number, since it uses less digits than its factorization.

666770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 666770 is about 816.5598569609. The cubic root of 666770 is about 87.3625597395.

The spelling of 666770 in words is "six hundred sixty-six thousand, seven hundred seventy".