671980 has 12 divisors (see below), whose sum is σ = 1411200. Its totient is φ = 268784.

The previous prime is 671971. The next prime is 671981. The reversal of 671980 is 89176.

671980 = T₄₀ + T₄₁ + ... + T₁₅₉.

It is not an unprimeable number, because it can be changed into a prime (671981) 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, 16780 + ... + 16819.

It is an arithmetic number, because the mean of its divisors is an integer number (117600).

2⁶⁷¹⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

671980 is an abundant number, since it is smaller than the sum of its proper divisors (739220).

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

671980 is a wasteful number, since it uses less digits than its factorization.

671980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33608 (or 33606 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 671980 is about 819.7438624351. The cubic root of 671980 is about 87.5895138369.

The spelling of 671980 in words is "six hundred seventy-one thousand, nine hundred eighty".