6648891 has 8 divisors (see below), whose sum is σ = 8946960. Its totient is φ = 4391712.

The previous prime is 6648883. The next prime is 6648977. The reversal of 6648891 is 1988466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6648891 - 2³ = 6648883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6648091) 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 7 ways as a sum of consecutive naturals, for example, 9840 + ... + 10493.

It is an arithmetic number, because the mean of its divisors is an integer number (1118370).

Almost surely, 2^6648891 is an apocalyptic number.

6648891 is a deficient number, since it is larger than the sum of its proper divisors (2298069).

6648891 is a wasteful number, since it uses less digits than its factorization.

6648891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20445.

The product of its digits is 82944, while the sum is 42.

The square root of 6648891 is about 2578.5443568029. The cubic root of 6648891 is about 188.0397814563.

The spelling of 6648891 in words is "six million, six hundred forty-eight thousand, eight hundred ninety-one".