664045 has 8 divisors (see below), whose sum is σ = 810720. Its totient is φ = 522000.

The previous prime is 664043. The next prime is 664061. The reversal of 664045 is 540466.

It is a happy number.

664045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 664045 - 2¹ = 664043 is a prime.

664045 is a lucky number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 831 + ... + 1420.

It is an arithmetic number, because the mean of its divisors is an integer number (101340).

2⁶⁶⁴⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

664045 is a deficient number, since it is larger than the sum of its proper divisors (146675).

664045 is a wasteful number, since it uses less digits than its factorization.

664045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 664045 is about 814.8895630697. The cubic root of 664045 is about 87.2433841996.

The spelling of 664045 in words is "six hundred sixty-four thousand, forty-five".