673621 has 4 divisors (see below), whose sum is σ = 725452. Its totient is φ = 621792.

The previous prime is 673619. The next prime is 673637. The reversal of 673621 is 126376.

673621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168100 + 505521 = 410^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 673621 - 2¹ = 673619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673121) 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, 25896 + ... + 25921.

It is an arithmetic number, because the mean of its divisors is an integer number (181363).

2⁶⁷³⁶²¹ is an apocalyptic number.

It is an amenable number.

673621 is a deficient number, since it is larger than the sum of its proper divisors (51831).

673621 is a wasteful number, since it uses less digits than its factorization.

673621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51830.

The product of its digits is 1512, while the sum is 25.

The square root of 673621 is about 820.7441745148. The cubic root of 673621 is about 87.6607548208.

Adding to 673621 its reverse (126376), we get a palindrome (799997).

The spelling of 673621 in words is "six hundred seventy-three thousand, six hundred twenty-one".