6445660 has 36 divisors (see below), whose sum is σ = 14664888. Its totient is φ = 2378688.

The previous prime is 6445639. The next prime is 6445661. The reversal of 6445660 is 665446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445661) 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 11 ways as a sum of consecutive naturals, for example, 2427 + ... + 4333.

It is an arithmetic number, because the mean of its divisors is an integer number (407358).

Almost surely, 2^6445660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6445660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7332444).

6445660 is an abundant number, since it is smaller than the sum of its proper divisors (8219228).

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

6445660 is a wasteful number, since it uses less digits than its factorization.

6445660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942 (or 1927 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6445660 is about 2538.8304393953. The cubic root of 6445660 is about 186.1040386082.

It can be divided in two parts, 64456 and 60, that added together give a square (64516 = 254²).

The spelling of 6445660 in words is "six million, four hundred forty-five thousand, six hundred sixty".