671220 has 96 divisors (see below), whose sum is σ = 2298240. Its totient is φ = 161280.

The previous prime is 671219. The next prime is 671233. The reversal of 671220 is 22176.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 671193 and 671202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5884 + ... + 5996.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2⁶⁷¹²²⁰ is an apocalyptic number.

671220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149120).

671220 is an abundant number, since it is smaller than the sum of its proper divisors (1627020).

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

671220 is a wasteful number, since it uses less digits than its factorization.

671220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 671220 is about 819.2801718582. The cubic root of 671220 is about 87.5564805412.

Adding to 671220 its reverse (22176), we get a palindrome (693396).

The spelling of 671220 in words is "six hundred seventy-one thousand, two hundred twenty".