6720800128 has 64 divisors (see below), whose sum is σ = 16201965600. Its totient is φ = 2710904832.

The previous prime is 6720800071. The next prime is 6720800129. The reversal of 6720800128 is 8210080276.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 6720800093 and 6720800102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720800129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205383 + ... + 235846.

Almost surely, 2^6720800128 is an apocalyptic number.

6720800128 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6720800128 is an abundant number, since it is smaller than the sum of its proper divisors (9481165472).

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

6720800128 is a wasteful number, since it uses less digits than its factorization.

6720800128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441267 (or 441255 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 6720800128 is about 81980.4862635005. The cubic root of 6720800128 is about 1887.1524851671.

The spelling of 6720800128 in words is "six billion, seven hundred twenty million, eight hundred thousand, one hundred twenty-eight".