6657780 has 48 divisors (see below), whose sum is σ = 19152000. Its totient is φ = 1726848.

The previous prime is 6657779. The next prime is 6657797. The reversal of 6657780 is 877566.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 721 + ... + 3719.

It is an arithmetic number, because the mean of its divisors is an integer number (399000).

Almost surely, 2^6657780 is an apocalyptic number.

6657780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6657780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9576000).

6657780 is an abundant number, since it is smaller than the sum of its proper divisors (12494220).

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

6657780 is a wasteful number, since it uses less digits than its factorization.

6657780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048 (or 3046 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 6657780 is about 2580.2674280004. The cubic root of 6657780 is about 188.1235418554.

The spelling of 6657780 in words is "six million, six hundred fifty-seven thousand, seven hundred eighty".