6630660 has 60 divisors (see below), whose sum is σ = 20805708. Its totient is φ = 1767744.

The previous prime is 6630653. The next prime is 6630661. The reversal of 6630660 is 660366.

It can be written as a sum of positive squares in 2 ways, for example, as 2566404 + 4064256 = 1602^2 + 2016^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6630661) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 427 + ... + 3666.

Almost surely, 2^6630660 is an apocalyptic number.

6630660 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 6630660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10402854).

6630660 is an abundant number, since it is smaller than the sum of its proper divisors (14175048).

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

6630660 is a wasteful number, since it uses less digits than its factorization.

6630660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114 (or 4103 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 6630660 is about 2575.0067961075. The cubic root of 6630660 is about 187.8677582158.

It can be divided in two parts, 66306 and 60, that added together give a palindrome (66366).

The spelling of 6630660 in words is "six million, six hundred thirty thousand, six hundred sixty".