671670 has 48 divisors (see below), whose sum is σ = 1853280. Its totient is φ = 168192.

The previous prime is 671651. The next prime is 671681. The reversal of 671670 is 76176.

It is a super-2 number, since 2×671670² = 902281177800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

671670 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 (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1311 + ... + 1749.

It is an arithmetic number, because the mean of its divisors is an integer number (38610).

2⁶⁷¹⁶⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926640).

671670 is an abundant number, since it is smaller than the sum of its proper divisors (1181610).

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

671670 is a wasteful number, since it uses less digits than its factorization.

671670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 671670 is about 819.5547571700. The cubic root of 671670 is about 87.5760427387.

It can be divided in two parts, 6716 and 70, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 671670 in words is "six hundred seventy-one thousand, six hundred seventy".