671580 has 144 divisors (see below), whose sum is σ = 2568384. Its totient is φ = 138240.

The previous prime is 671557. The next prime is 671581. The reversal of 671580 is 85176.

It is a nialpdrome in base 6.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671581) by changing a digit.

671580 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 47 ways as a sum of consecutive naturals, for example, 16360 + ... + 16400.

It is an arithmetic number, because the mean of its divisors is an integer number (17836).

2⁶⁷¹⁵⁸⁰ is an apocalyptic number.

671580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is a pronic number, being equal to 819×820.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1284192).

671580 is an abundant number, since it is smaller than the sum of its proper divisors (1896804).

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

671580 is a wasteful number, since it uses less digits than its factorization.

671580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 671580 is about 819.4998474680. The cubic root of 671580 is about 87.5721309984.

The spelling of 671580 in words is "six hundred seventy-one thousand, five hundred eighty".