6661140 has 48 divisors (see below), whose sum is σ = 18940992. Its totient is φ = 1748736.

The previous prime is 6661117. The next prime is 6661141. The reversal of 6661140 is 411666.

It is a self number, because there is not a number n which added to its sum of digits gives 6661140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3192 + ... + 4848.

It is an arithmetic number, because the mean of its divisors is an integer number (394604).

Almost surely, 2^6661140 is an apocalyptic number.

6661140 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 6661140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9470496).

6661140 is an abundant number, since it is smaller than the sum of its proper divisors (12279852).

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

6661140 is a wasteful number, since it uses less digits than its factorization.

6661140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1734 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 6661140 is about 2580.9184411755. The cubic root of 6661140 is about 188.1551834735.

The spelling of 6661140 in words is "six million, six hundred sixty-one thousand, one hundred forty".