7644403728 has 80 divisors (see below), whose sum is σ = 23630154240. Its totient is φ = 2352122496.

The previous prime is 7644403721. The next prime is 7644403747. The reversal of 7644403728 is 8273044467.

It is not an unprimeable number, because it can be changed into a prime (7644403721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674976 + ... + 686207.

It is an arithmetic number, because the mean of its divisors is an integer number (295376928).

Almost surely, 2^7644403728 is an apocalyptic number.

7644403728 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

7644403728 is an abundant number, since it is smaller than the sum of its proper divisors (15985750512).

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

7644403728 is a wasteful number, since it uses less digits than its factorization.

7644403728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361213 (or 1361201 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 45.

The square root of 7644403728 is about 87432.2808120662. The cubic root of 7644403728 is about 1969.9167450021.

The spelling of 7644403728 in words is "seven billion, six hundred forty-four million, four hundred three thousand, seven hundred twenty-eight".