671868 has 24 divisors (see below), whose sum is σ = 1742160. Its totient is φ = 223920.

The previous prime is 671851. The next prime is 671887. The reversal of 671868 is 868176.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

671868 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 7 ways as a sum of consecutive naturals, for example, 3003 + ... + 3218.

It is an arithmetic number, because the mean of its divisors is an integer number (72590).

2⁶⁷¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

671868 is an abundant number, since it is smaller than the sum of its proper divisors (1070292).

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

671868 is a wasteful number, since it uses less digits than its factorization.

671868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6234 (or 6226 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 671868 is about 819.6755455667. The cubic root of 671868 is about 87.5846473376.

It can be divided in two parts, 6718 and 68, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 671868 in words is "six hundred seventy-one thousand, eight hundred sixty-eight".