664013 has 8 divisors (see below), whose sum is σ = 785280. Its totient is φ = 549360.

The previous prime is 664009. The next prime is 664019. The reversal of 664013 is 310466.

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

It is not a de Polignac number, because 664013 - 2² = 664009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664019) 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, 1433 + ... + 1838.

It is an arithmetic number, because the mean of its divisors is an integer number (98160).

2⁶⁶⁴⁰¹³ is an apocalyptic number.

It is an amenable number.

664013 is a deficient number, since it is larger than the sum of its proper divisors (121267).

664013 is a wasteful number, since it uses less digits than its factorization.

664013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 664013 is about 814.8699282708. The cubic root of 664013 is about 87.2419827720.

Adding to 664013 its reverse (310466), we get a palindrome (974479).

It can be divided in two parts, 6640 and 13, that multiplied together give a triangular number (86320 = T₄₁₅).

The spelling of 664013 in words is "six hundred sixty-four thousand, thirteen".