6647880 has 32 divisors (see below), whose sum is σ = 19944000. Its totient is φ = 1772736.

The previous prime is 6647869. The next prime is 6647887. The reversal of 6647880 is 887466.

It is not an unprimeable number, because it can be changed into a prime (6647887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27580 + ... + 27819.

It is an arithmetic number, because the mean of its divisors is an integer number (623250).

Almost surely, 2^6647880 is an apocalyptic number.

6647880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6647880 is an abundant number, since it is smaller than the sum of its proper divisors (13296120).

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

6647880 is a wasteful number, since it uses less digits than its factorization.

6647880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55413 (or 55409 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 6647880 is about 2578.3483085107. The cubic root of 6647880 is about 188.0302501497.

The spelling of 6647880 in words is "six million, six hundred forty-seven thousand, eight hundred eighty".