6660780 has 48 divisors (see below), whose sum is σ = 21315840. Its totient is φ = 1522368.

The previous prime is 6660763. The next prime is 6660781. The reversal of 6660780 is 870666.

It is not an unprimeable number, because it can be changed into a prime (6660781) 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 15 ways as a sum of consecutive naturals, for example, 7510 + ... + 8349.

It is an arithmetic number, because the mean of its divisors is an integer number (444080).

Almost surely, 2^6660780 is an apocalyptic number.

6660780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6660780 is an abundant number, since it is smaller than the sum of its proper divisors (14655060).

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

6660780 is a wasteful number, since it uses less digits than its factorization.

6660780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15878 (or 15876 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 6660780 is about 2580.8486976187. The cubic root of 6660780 is about 188.1517938092.

The spelling of 6660780 in words is "six million, six hundred sixty thousand, seven hundred eighty".