664073 has 4 divisors (see below), whose sum is σ = 665808. Its totient is φ = 662340.

The previous prime is 664067. The next prime is 664091. The reversal of 664073 is 370466.

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, and also an emirpimes, since its reverse is a distinct semiprime: 370466 = 2 ⋅185233.

It is a cyclic number.

It is not a de Polignac number, because 664073 - 2⁶ = 664009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664043) 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, 11 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (166452).

2⁶⁶⁴⁰⁷³ is an apocalyptic number.

It is an amenable number.

664073 is a deficient number, since it is larger than the sum of its proper divisors (1735).

664073 is a wasteful number, since it uses less digits than its factorization.

664073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 664073 is about 814.9067431308. The cubic root of 664073 is about 87.2446104119.

The spelling of 664073 in words is "six hundred sixty-four thousand, seventy-three".