6649881 has 8 divisors (see below), whose sum is σ = 10133184. Its totient is φ = 3799920.

The previous prime is 6649871. The next prime is 6649883. The reversal of 6649881 is 1889466.

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

It is not a de Polignac number, because 6649881 - 2⁵ = 6649849 is a prime.

It is a super-2 number, since 2×6649881² = 88441834628322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6649883) 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 7 ways as a sum of consecutive naturals, for example, 158310 + ... + 158351.

It is an arithmetic number, because the mean of its divisors is an integer number (1266648).

Almost surely, 2^6649881 is an apocalyptic number.

It is an amenable number.

6649881 is a deficient number, since it is larger than the sum of its proper divisors (3483303).

6649881 is a wasteful number, since it uses less digits than its factorization.

6649881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316671.

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

The square root of 6649881 is about 2578.7363184320. The cubic root of 6649881 is about 188.0491138469.

The spelling of 6649881 in words is "six million, six hundred forty-nine thousand, eight hundred eighty-one".