664007 has 4 divisors (see below), whose sum is σ = 665640. Its totient is φ = 662376.

The previous prime is 663997. The next prime is 664009. The reversal of 664007 is 700466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 664007 - 2⁴ = 663991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664007.

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 3 ways as a sum of consecutive naturals, for example, 344 + ... + 1202.

It is an arithmetic number, because the mean of its divisors is an integer number (166410).

2⁶⁶⁴⁰⁰⁷ is an apocalyptic number.

664007 is a deficient number, since it is larger than the sum of its proper divisors (1633).

664007 is an equidigital number, since it uses as much as digits as its factorization.

664007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 664007 is about 814.8662466933. The cubic root of 664007 is about 87.2417199993.

It can be divided in two parts, 66 and 4007, that multiplied together give a palindrome (264462).

The spelling of 664007 in words is "six hundred sixty-four thousand, seven".