6481780 has 12 divisors (see below), whose sum is σ = 13611780. Its totient is φ = 2592704.

The previous prime is 6481763. The next prime is 6481789. The reversal of 6481780 is 871846.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2999824 + 3481956 = 1732^2 + 1866^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6481789) 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 3 ways as a sum of consecutive naturals, for example, 162025 + ... + 162064.

It is an arithmetic number, because the mean of its divisors is an integer number (1134315).

Almost surely, 2^6481780 is an apocalyptic number.

It is an amenable number.

6481780 is an abundant number, since it is smaller than the sum of its proper divisors (7130000).

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

6481780 is a wasteful number, since it uses less digits than its factorization.

6481780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324098 (or 324096 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 6481780 is about 2545.9340132847. The cubic root of 6481780 is about 186.4510193928.

The spelling of 6481780 in words is "six million, four hundred eighty-one thousand, seven hundred eighty".