6648881 has 4 divisors (see below), whose sum is σ = 6729072. Its totient is φ = 6568692.

The previous prime is 6648839. The next prime is 6648883. The reversal of 6648881 is 1888466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1888466 = 2 ⋅944233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6648881 is a prime.

It is a super-2 number, since 2×6648881² = 88415237104322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6648883) 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 in 3 ways as a sum of consecutive naturals, for example, 39971 + ... + 40136.

It is an arithmetic number, because the mean of its divisors is an integer number (1682268).

Almost surely, 2^6648881 is an apocalyptic number.

It is an amenable number.

6648881 is a deficient number, since it is larger than the sum of its proper divisors (80191).

6648881 is an equidigital number, since it uses as much as digits as its factorization.

6648881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80190.

The product of its digits is 73728, while the sum is 41.

The square root of 6648881 is about 2578.5424177236. The cubic root of 6648881 is about 188.0396871850.

The spelling of 6648881 in words is "six million, six hundred forty-eight thousand, eight hundred eighty-one".