6381660 has 96 divisors (see below), whose sum is σ = 19095552. Its totient is φ = 1589760.

The previous prime is 6381659. The next prime is 6381667. The reversal of 6381660 is 661836.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87384 + ... + 87456.

It is an arithmetic number, because the mean of its divisors is an integer number (198912).

Almost surely, 2^6381660 is an apocalyptic number.

6381660 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 6381660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9547776).

6381660 is an abundant number, since it is smaller than the sum of its proper divisors (12713892).

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

6381660 is a wasteful number, since it uses less digits than its factorization.

6381660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 6381660 is about 2526.1947668381. The cubic root of 6381660 is about 185.4860362973.

The spelling of 6381660 in words is "six million, three hundred eighty-one thousand, six hundred sixty".