6561880 has 32 divisors (see below), whose sum is σ = 15901200. Its totient is φ = 2422656.

The previous prime is 6561871. The next prime is 6561883. The reversal of 6561880 is 881656.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5790 + ... + 6829.

Almost surely, 2^6561880 is an apocalyptic number.

It is an amenable number.

6561880 is an abundant number, since it is smaller than the sum of its proper divisors (9339320).

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

6561880 is a wasteful number, since it uses less digits than its factorization.

6561880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12643 (or 12639 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 6561880 is about 2561.6166770225. The cubic root of 6561880 is about 187.2159134937.

The spelling of 6561880 in words is "six million, five hundred sixty-one thousand, eight hundred eighty".