6648399 has 20 divisors (see below), whose sum is σ = 10004280. Its totient is φ = 4399920.

The previous prime is 6648371. The next prime is 6648401. The reversal of 6648399 is 9938466.

It is not a de Polignac number, because 6648399 - 2⁸ = 6648143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6648599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16897 + ... + 17285.

It is an arithmetic number, because the mean of its divisors is an integer number (500214).

Almost surely, 2^6648399 is an apocalyptic number.

6648399 is a deficient number, since it is larger than the sum of its proper divisors (3355881).

6648399 is a wasteful number, since it uses less digits than its factorization.

6648399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612 (or 603 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 6648399 is about 2578.4489523743. The cubic root of 6648399 is about 188.0351431963.

The spelling of 6648399 in words is "six million, six hundred forty-eight thousand, three hundred ninety-nine".