671216 has 40 divisors (see below), whose sum is σ = 1604064. Its totient is φ = 264960.

The previous prime is 671201. The next prime is 671219. The reversal of 671216 is 612176.

It is a junction number, because it is equal to n+sod(n) for n = 671191 and 671200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671219) by changing a digit.

671216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226 + ... + 1686.

2⁶⁷¹²¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802032).

671216 is an abundant number, since it is smaller than the sum of its proper divisors (932848).

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

671216 is a wasteful number, since it uses less digits than its factorization.

671216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 483 counting only the distinct ones).

The product of its digits is 504, while the sum is 23.

The square root of 671216 is about 819.2777306872. The cubic root of 671216 is about 87.5563066158.

The spelling of 671216 in words is "six hundred seventy-one thousand, two hundred sixteen".