671606 has 12 divisors (see below), whose sum is σ = 1091412. Its totient is φ = 309816.

The previous prime is 671603. The next prime is 671609. The reversal of 671606 is 606176.

It is an interprime number because it is at equal distance from previous prime (671603) and next prime (671609).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671603) 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 5 ways as a sum of consecutive naturals, for example, 656 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (90951).

2⁶⁷¹⁶⁰⁶ is an apocalyptic number.

671606 is a deficient number, since it is larger than the sum of its proper divisors (419806).

671606 is a wasteful number, since it uses less digits than its factorization.

671606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015 (or 2002 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 671606 is about 819.5157106487. The cubic root of 671606 is about 87.5732610926.

The spelling of 671606 in words is "six hundred seventy-one thousand, six hundred six".