2664005 has 4 divisors (see below), whose sum is σ = 3196812. Its totient is φ = 2131200.

The previous prime is 2664001. The next prime is 2664017. The reversal of 2664005 is 5004662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 863041 + 1800964 = 929^2 + 1342^2 .

It is not a de Polignac number, because 2664005 - 2² = 2664001 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 (2664001) 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, 266396 + ... + 266405.

It is an arithmetic number, because the mean of its divisors is an integer number (799203).

2^2664005 is an apocalyptic number.

It is an amenable number.

2664005 is a deficient number, since it is larger than the sum of its proper divisors (532807).

2664005 is an equidigital number, since it uses as much as digits as its factorization.

2664005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532806.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2664005 is about 1632.1779927447. The cubic root of 2664005 is about 138.6261020965.

Adding to 2664005 its reverse (5004662), we get a palindrome (7668667).

The spelling of 2664005 in words is "two million, six hundred sixty-four thousand, five".