6606728640 has 168 divisors, whose sum is σ = 23920612560. Its totient is φ = 1669054464.

The previous prime is 6606728617. The next prime is 6606728651. The reversal of 6606728640 is 468276066.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5649 + ... + 115088.

Almost surely, 2^6606728640 is an apocalyptic number.

6606728640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6606728640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11960306280).

6606728640 is an abundant number, since it is smaller than the sum of its proper divisors (17313883920).

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

6606728640 is a wasteful number, since it uses less digits than its factorization.

6606728640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120779 (or 120766 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 6606728640 is about 81281.7854134615. The cubic root of 6606728640 is about 1876.4146848871.

The spelling of 6606728640 in words is "six billion, six hundred six million, seven hundred twenty-eight thousand, six hundred forty".