6649637 has 4 divisors (see below), whose sum is σ = 6679680. Its totient is φ = 6619596.

The previous prime is 6649633. The next prime is 6649661. The reversal of 6649637 is 7369466.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 6649637 - 2² = 6649633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6649594 and 6649603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649631) 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 3 ways as a sum of consecutive naturals, for example, 14687 + ... + 15132.

It is an arithmetic number, because the mean of its divisors is an integer number (1669920).

Almost surely, 2^6649637 is an apocalyptic number.

It is an amenable number.

6649637 is a deficient number, since it is larger than the sum of its proper divisors (30043).

6649637 is a wasteful number, since it uses less digits than its factorization.

6649637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30042.

The product of its digits is 163296, while the sum is 41.

The square root of 6649637 is about 2578.6890080039. The cubic root of 6649637 is about 188.0468138286.

It can be divided in two parts, 664 and 9637, that added together give a palindrome (10301).

The spelling of 6649637 in words is "six million, six hundred forty-nine thousand, six hundred thirty-seven".