6365128644 has 144 divisors (see below), whose sum is σ = 19505985408. Its totient is φ = 1708452864.

The previous prime is 6365128633. The next prime is 6365128657. The reversal of 6365128644 is 4468215636.

6365128644 is a `hidden beast` number, since 6 + 365 + 1 + 286 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6365128644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3139159 + ... + 3141185.

It is an arithmetic number, because the mean of its divisors is an integer number (135458232).

Almost surely, 2^6365128644 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 6365128644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9752992704).

6365128644 is an abundant number, since it is smaller than the sum of its proper divisors (13140856764).

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

6365128644 is a wasteful number, since it uses less digits than its factorization.

6365128644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794 (or 2789 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 6365128644 is about 79781.7563356436. The cubic root of 6365128644 is about 1853.2573384495.

The spelling of 6365128644 in words is "six billion, three hundred sixty-five million, one hundred twenty-eight thousand, six hundred forty-four".