6644026 has 4 divisors (see below), whose sum is σ = 9966042. Its totient is φ = 3322012.

The previous prime is 6644023. The next prime is 6644047. The reversal of 6644026 is 6204466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6204466 = 2 ⋅3102233.

It can be written as a sum of positive squares in only one way, i.e., 5832225 + 811801 = 2415^2 + 901^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6643985 and 6644003.

It is not an unprimeable number, because it can be changed into a prime (6644023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661005 + ... + 1661008.

Almost surely, 2^6644026 is an apocalyptic number.

6644026 is a deficient number, since it is larger than the sum of its proper divisors (3322016).

6644026 is a wasteful number, since it uses less digits than its factorization.

6644026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322015.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 6644026 is about 2577.6008224704. The cubic root of 6644026 is about 187.9939073022.

It can be divided in two parts, 66440 and 26, that added together give a palindrome (66466).

The spelling of 6644026 in words is "six million, six hundred forty-four thousand, twenty-six".