671646 has 32 divisors (see below), whose sum is σ = 1456128. Its totient is φ = 205920.

The previous prime is 671633. The next prime is 671647. The reversal of 671646 is 646176.

It is a super-2 number, since 2×671646² = 902216698632, which contains 22 as substring.

Its product of digits (6048) is a multiple of the sum of its prime divisors (216).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671647) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4200 + ... + 4356.

It is an arithmetic number, because the mean of its divisors is an integer number (45504).

2⁶⁷¹⁶⁴⁶ is an apocalyptic number.

671646 is an abundant number, since it is smaller than the sum of its proper divisors (784482).

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

671646 is a wasteful number, since it uses less digits than its factorization.

671646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216.

The product of its digits is 6048, while the sum is 30.

The square root of 671646 is about 819.5401149425. The cubic root of 671646 is about 87.5749996421.

The spelling of 671646 in words is "six hundred seventy-one thousand, six hundred forty-six".