6561780 has 24 divisors (see below), whose sum is σ = 18373152. Its totient is φ = 1749792.

The previous prime is 6561767. The next prime is 6561781. The reversal of 6561780 is 871656.

It is a super-3 number, since 3×6561780³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561781) 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 7 ways as a sum of consecutive naturals, for example, 54622 + ... + 54741.

It is an arithmetic number, because the mean of its divisors is an integer number (765548).

Almost surely, 2^6561780 is an apocalyptic number.

6561780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6561780 is an abundant number, since it is smaller than the sum of its proper divisors (11811372).

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

6561780 is a wasteful number, since it uses less digits than its factorization.

6561780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109375 (or 109373 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 6561780 is about 2561.5971580247. The cubic root of 6561780 is about 187.2149624610.

The spelling of 6561780 in words is "six million, five hundred sixty-one thousand, seven hundred eighty".