6505128344 has 128 divisors (see below), whose sum is σ = 15230073600. Its totient is φ = 2560688640.

The previous prime is 6505128307. The next prime is 6505128361. The reversal of 6505128344 is 4438215056.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 6505128298 and 6505128307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2324354 + ... + 2327150.

It is an arithmetic number, because the mean of its divisors is an integer number (118984950).

Almost surely, 2^6505128344 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 6505128344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7615036800).

6505128344 is an abundant number, since it is smaller than the sum of its proper divisors (8724945256).

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

6505128344 is a wasteful number, since it uses less digits than its factorization.

6505128344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 6505128344 is about 80654.3758515308. The cubic root of 6505128344 is about 1866.7462596731.

It can be divided in two parts, 650512 and 8344, that added together give a palindrome (658856).

The spelling of 6505128344 in words is "six billion, five hundred five million, one hundred twenty-eight thousand, three hundred forty-four".