6604640728 has 128 divisors (see below), whose sum is σ = 15079680000. Its totient is φ = 2651927040.

The previous prime is 6604640723. The next prime is 6604640741. The reversal of 6604640728 is 8270464066.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6604640723) 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, 18924298 + ... + 18924646.

It is an arithmetic number, because the mean of its divisors is an integer number (117810000).

Almost surely, 2^6604640728 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 6604640728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7539840000).

6604640728 is an abundant number, since it is smaller than the sum of its proper divisors (8475039272).

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

6604640728 is a wasteful number, since it uses less digits than its factorization.

6604640728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The square root of 6604640728 is about 81268.9407338375. The cubic root of 6604640728 is about 1876.2169974620.

The spelling of 6604640728 in words is "six billion, six hundred four million, six hundred forty thousand, seven hundred twenty-eight".