6649280 has 56 divisors (see below), whose sum is σ = 17282160. Its totient is φ = 2416640.

The previous prime is 6649273. The next prime is 6649289. The reversal of 6649280 is 829466.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6649280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649289) 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, 2576 + ... + 4464.

It is an arithmetic number, because the mean of its divisors is an integer number (308610).

Almost surely, 2^6649280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6649280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8641080).

6649280 is an abundant number, since it is smaller than the sum of its proper divisors (10632880).

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

6649280 is a wasteful number, since it uses less digits than its factorization.

6649280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917 (or 1907 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 6649280 is about 2578.6197858544. The cubic root of 6649280 is about 188.0434485364.

The spelling of 6649280 in words is "six million, six hundred forty-nine thousand, two hundred eighty".