6649988 has 12 divisors (see below), whose sum is σ = 11657100. Its totient is φ = 3319392.

The previous prime is 6649919. The next prime is 6649999. The reversal of 6649988 is 8899466.

It can be written as a sum of positive squares in 2 ways, for example, as 2617924 + 4032064 = 1618^2 + 2008^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2438 + ... + 4386.

It is an arithmetic number, because the mean of its divisors is an integer number (971425).

Almost surely, 2^6649988 is an apocalyptic number.

It is an amenable number.

6649988 is a deficient number, since it is larger than the sum of its proper divisors (5007112).

6649988 is a wasteful number, since it uses less digits than its factorization.

6649988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806 (or 2804 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 6649988 is about 2578.7570649443. The cubic root of 6649988 is about 188.0501224438.

The spelling of 6649988 in words is "six million, six hundred forty-nine thousand, nine hundred eighty-eight".