673581 has 4 divisors (see below), whose sum is σ = 898112. Its totient is φ = 449052.

The previous prime is 673579. The next prime is 673609. The reversal of 673581 is 185376.

673581 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 673581 - 2¹ = 673579 is a prime.

It is a super-2 number, since 2×673581² = 907422727122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673381) 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, 112261 + ... + 112266.

It is an arithmetic number, because the mean of its divisors is an integer number (224528).

2⁶⁷³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

673581 is a deficient number, since it is larger than the sum of its proper divisors (224531).

673581 is a wasteful number, since it uses less digits than its factorization.

673581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224530.

The product of its digits is 5040, while the sum is 30.

The square root of 673581 is about 820.7198060240. The cubic root of 673581 is about 87.6590196713.

The spelling of 673581 in words is "six hundred seventy-three thousand, five hundred eighty-one".