671722 has 8 divisors (see below), whose sum is σ = 1026756. Its totient is φ = 329472.

The previous prime is 671717. The next prime is 671729. The reversal of 671722 is 227176.

It can be written as a sum of positive squares in 2 ways, for example, as 670761 + 961 = 819^2 + 31^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (671729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3063 + ... + 3274.

2⁶⁷¹⁷²² is an apocalyptic number.

671722 is a deficient number, since it is larger than the sum of its proper divisors (355034).

671722 is a wasteful number, since it uses less digits than its factorization.

671722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6392.

The product of its digits is 1176, while the sum is 25.

The square root of 671722 is about 819.5864810989. The cubic root of 671722 is about 87.5783026961.

Adding to 671722 its reverse (227176), we get a palindrome (898898).

The spelling of 671722 in words is "six hundred seventy-one thousand, seven hundred twenty-two".