6649980 has 48 divisors (see below), whose sum is σ = 18779040. Its totient is φ = 1758208.

The previous prime is 6649919. The next prime is 6649999. The reversal of 6649980 is 899466.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7816 + ... + 8624.

It is an arithmetic number, because the mean of its divisors is an integer number (391230).

Almost surely, 2^6649980 is an apocalyptic number.

6649980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6649980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9389520).

6649980 is an abundant number, since it is smaller than the sum of its proper divisors (12129060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6649980 is a wasteful number, since it uses less digits than its factorization.

6649980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958 (or 956 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 6649980 is about 2578.7555138089. The cubic root of 6649980 is about 188.0500470351.

The spelling of 6649980 in words is "six million, six hundred forty-nine thousand, nine hundred eighty".