671604 has 12 divisors (see below), whose sum is σ = 1567104. Its totient is φ = 223864.

The previous prime is 671603. The next prime is 671609. The reversal of 671604 is 406176.

It is a tau number, because it is divible by the number of its divisors (12).

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27972 + ... + 27995.

It is an arithmetic number, because the mean of its divisors is an integer number (130592).

2⁶⁷¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

671604 is an abundant number, since it is smaller than the sum of its proper divisors (895500).

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

671604 is a wasteful number, since it uses less digits than its factorization.

671604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55974 (or 55972 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 671604 is about 819.5144904149. The cubic root of 671604 is about 87.5731741633.

It can be divided in two parts, 671 and 604, that added together give a triangular number (1275 = T₅₀).

The spelling of 671604 in words is "six hundred seventy-one thousand, six hundred four".