664039 has 8 divisors (see below), whose sum is σ = 692208. Its totient is φ = 636480.

The previous prime is 664019. The next prime is 664043. The reversal of 664039 is 930466.

664039 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 a cyclic number.

It is not a de Polignac number, because 664039 - 2¹³ = 655847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663998 and 664016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664009) 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, 4779 + ... + 4915.

It is an arithmetic number, because the mean of its divisors is an integer number (86526).

2⁶⁶⁴⁰³⁹ is an apocalyptic number.

664039 is a deficient number, since it is larger than the sum of its proper divisors (28169).

664039 is a wasteful number, since it uses less digits than its factorization.

664039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 664039 is about 814.8858815810. The cubic root of 664039 is about 87.2431214354.

The spelling of 664039 in words is "six hundred sixty-four thousand, thirty-nine".